Remove beginning define in source files

```
sed -i "/^#define JEMALLOC_[A-Z_]*_C_$/d" src/*.c;
```

src/arena.c

@@ -1,4 +1,3 @@
-#define JEMALLOC_ARENA_C_
 #include "jemalloc/internal/jemalloc_preamble.h"
 #include "jemalloc/internal/jemalloc_internal_includes.h"
 

src/background_thread.c

@@ -1,4 +1,3 @@
-#define JEMALLOC_BACKGROUND_THREAD_C_
 #include "jemalloc/internal/jemalloc_preamble.h"
 #include "jemalloc/internal/jemalloc_internal_includes.h"
 

src/base.c

@@ -1,4 +1,3 @@
-#define JEMALLOC_BASE_C_
 #include "jemalloc/internal/jemalloc_preamble.h"
 #include "jemalloc/internal/jemalloc_internal_includes.h"
 

src/bitmap.c

@@ -1,4 +1,3 @@
-#define JEMALLOC_BITMAP_C_
 #include "jemalloc/internal/jemalloc_preamble.h"
 #include "jemalloc/internal/jemalloc_internal_includes.h"
 

src/buf_writer.c

@@ -1,4 +1,3 @@
-#define JEMALLOC_BUF_WRITER_C_
 #include "jemalloc/internal/jemalloc_preamble.h"
 #include "jemalloc/internal/jemalloc_internal_includes.h"
 

src/ckh.c

@@ -34,7 +34,6 @@
  * respectively.
  *
  ******************************************************************************/
-#define JEMALLOC_CKH_C_
 #include "jemalloc/internal/jemalloc_preamble.h"
 
 #include "jemalloc/internal/ckh.h"

src/counter.c

@@ -1,4 +1,3 @@
-#define JEMALLOC_COUNTER_C_
 #include "jemalloc/internal/jemalloc_preamble.h"
 #include "jemalloc/internal/jemalloc_internal_includes.h"
 

src/ctl.c

@@ -1,4 +1,3 @@
-#define JEMALLOC_CTL_C_
 #include "jemalloc/internal/jemalloc_preamble.h"
 #include "jemalloc/internal/jemalloc_internal_includes.h"
 

src/extent_dss.c

@@ -1,4 +1,3 @@
-#define JEMALLOC_EXTENT_DSS_C_
 #include "jemalloc/internal/jemalloc_preamble.h"
 #include "jemalloc/internal/jemalloc_internal_includes.h"
 

src/extent_mmap.c

@@ -1,4 +1,3 @@
-#define JEMALLOC_EXTENT_MMAP_C_
 #include "jemalloc/internal/jemalloc_preamble.h"
 #include "jemalloc/internal/jemalloc_internal_includes.h"
 

src/hash.c

@@ -1,3 +1,2 @@
-#define JEMALLOC_HASH_C_
 #include "jemalloc/internal/jemalloc_preamble.h"
 #include "jemalloc/internal/jemalloc_internal_includes.h"

src/large.c

@@ -1,4 +1,3 @@
-#define JEMALLOC_LARGE_C_
 #include "jemalloc/internal/jemalloc_preamble.h"
 #include "jemalloc/internal/jemalloc_internal_includes.h"
 

src/malloc_io.c

@@ -1,4 +1,3 @@
-#define JEMALLOC_MALLOC_IO_C_
 #include "jemalloc/internal/jemalloc_preamble.h"
 #include "jemalloc/internal/jemalloc_internal_includes.h"
 

src/mutex.c

@@ -1,4 +1,3 @@
-#define JEMALLOC_MUTEX_C_
 #include "jemalloc/internal/jemalloc_preamble.h"
 #include "jemalloc/internal/jemalloc_internal_includes.h"
 

src/mutex_pool.c

@@ -1,4 +1,3 @@
-#define JEMALLOC_MUTEX_POOL_C_
 
 #include "jemalloc/internal/jemalloc_preamble.h"
 #include "jemalloc/internal/jemalloc_internal_includes.h"

src/pages.c

@@ -1,4 +1,3 @@
-#define JEMALLOC_PAGES_C_
 #include "jemalloc/internal/jemalloc_preamble.h"
 
 #include "jemalloc/internal/pages.h"

src/prng.c

@@ -1,3 +1,2 @@
-#define JEMALLOC_PRNG_C_
 #include "jemalloc/internal/jemalloc_preamble.h"
 #include "jemalloc/internal/jemalloc_internal_includes.h"

src/prof.c

@@ -1,4 +1,3 @@
-#define JEMALLOC_PROF_C_
 #include "jemalloc/internal/jemalloc_preamble.h"
 #include "jemalloc/internal/jemalloc_internal_includes.h"
 

src/prof_data.c

@@ -1,4 +1,3 @@
-#define JEMALLOC_PROF_C_
 #include "jemalloc/internal/jemalloc_preamble.h"
 #include "jemalloc/internal/jemalloc_internal_includes.h"
 

src/prof_log.c

@@ -1,4 +1,3 @@
-#define JEMALLOC_PROF_C_
 #include "jemalloc/internal/jemalloc_preamble.h"
 #include "jemalloc/internal/jemalloc_internal_includes.h"
 

src/prof_recent.c

@@ -1,4 +1,3 @@
-#define JEMALLOC_PROF_RECENT_C_
 #include "jemalloc/internal/jemalloc_preamble.h"
 #include "jemalloc/internal/jemalloc_internal_includes.h"
 

src/rtree.c

@@ -1,4 +1,3 @@
-#define JEMALLOC_RTREE_C_
 #include "jemalloc/internal/jemalloc_preamble.h"
 #include "jemalloc/internal/jemalloc_internal_includes.h"
 

src/stats.c

@@ -1,4 +1,3 @@
-#define JEMALLOC_STATS_C_
 #include "jemalloc/internal/jemalloc_preamble.h"
 #include "jemalloc/internal/jemalloc_internal_includes.h"
 

src/tcache.c

@@ -1,4 +1,3 @@
-#define JEMALLOC_TCACHE_C_
 #include "jemalloc/internal/jemalloc_preamble.h"
 #include "jemalloc/internal/jemalloc_internal_includes.h"
 

src/thread_event.c

@@ -1,4 +1,3 @@
-#define JEMALLOC_THREAD_EVENT_C_
 #include "jemalloc/internal/jemalloc_preamble.h"
 #include "jemalloc/internal/jemalloc_internal_includes.h"
 

src/ticker.c

@@ -1,3 +1,2 @@
-#define JEMALLOC_TICKER_C_
 #include "jemalloc/internal/jemalloc_preamble.h"
 #include "jemalloc/internal/jemalloc_internal_includes.h"

src/tsd.c

@@ -1,4 +1,3 @@
-#define JEMALLOC_TSD_C_
 #include "jemalloc/internal/jemalloc_preamble.h"
 #include "jemalloc/internal/jemalloc_internal_includes.h"
 

src/witness.c

@@ -1,4 +1,3 @@
-#define JEMALLOC_WITNESS_C_
 #include "jemalloc/internal/jemalloc_preamble.h"
 #include "jemalloc/internal/jemalloc_internal_includes.h"