mimalloc: adjust for building inside Git

We want to compile mimalloc's source code as part of Git, rather than
requiring the code to be built as an external library: mimalloc uses a
CMake-based build, which is not necessarily easy to integrate into the
flavors of Git for Windows (which will be the main benefitting port).

Signed-off-by: Johannes Schindelin <[email protected]>
Signed-off-by: Matthias Aßhauer <[email protected]>

Author: dscho

compat/mimalloc/alloc.c

@@ -17,7 +17,6 @@ terms of the MIT license. A copy of the license can be found in the file
 #include <stdlib.h>      // malloc, abort
 
 #define MI_IN_ALLOC_C
-#include "alloc-override.c"
 #include "free.c"
 #undef MI_IN_ALLOC_C
 

compat/mimalloc/mimalloc.h

@@ -95,7 +95,8 @@ terms of the MIT license. A copy of the license can be found in the file
 // Includes
 // ------------------------------------------------------
 
-#include <stddef.h>     // size_t
+#include "compat/posix.h"
+
 #include <stdbool.h>    // bool
 #include <stdint.h>     // INTPTR_MAX