fixup??? mimalloc: offer a build-time option to enable it

This is needed to ensure that the reftable tests have the correct idea
which allocator to use.

Suggested-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

Author: dscho

compat/posix.h

@@ -176,6 +176,16 @@ typedef unsigned long uintptr_t;
 #define _ALL_SOURCE 1
 #endif
 
+#ifdef USE_MIMALLOC
+#include "mimalloc.h"
+#define malloc mi_malloc
+#define calloc mi_calloc
+#define realloc mi_realloc
+#define free mi_free
+#define strdup mi_strdup
+#define strndup mi_strndup
+#endif
+
 #ifdef MKDIR_WO_TRAILING_SLASH
 #define mkdir(a,b) compat_mkdir_wo_trailing_slash((a),(b))
 int compat_mkdir_wo_trailing_slash(const char*, mode_t);

git-compat-util.h

@@ -226,16 +226,6 @@ static inline const char *precompose_string_if_needed(const char *in)
 # include <sys/sysinfo.h>
 #endif
 
-#ifdef USE_MIMALLOC
-#include "mimalloc.h"
-#define malloc mi_malloc
-#define calloc mi_calloc
-#define realloc mi_realloc
-#define free mi_free
-#define strdup mi_strdup
-#define strndup mi_strndup
-#endif
-
 #ifndef PATH_SEP
 #define PATH_SEP ':'
 #endif