Include <stdlib.h> for !USE_MMALLOC, so that the malloc etc.
prototypes are available. For C99 compatibility.
This seems to have been fixed in <https://github.com/ingwarsw/tinyfugue>
in a different way.
diff --git a/src/malloc.h b/src/malloc.h
index cc4d3bf317b09b06..2e649de2651c1edf 100644
--- a/src/malloc.h
+++ b/src/malloc.h
@@ -34,6 +34,7 @@ extern int low_memory_warning;
# define realloc(ptr, size) mrealloc(NULL, ptr, size)
# define free(ptr) mfree(NULL, ptr)
#else
+# include <stdlib.h>
# define mmalloc(md, size) malloc(size)
# define mcalloc(md, size) calloc(size)
# define mrealloc(md, ptr, size) realloc(ptr, size)