Rename gitfakemmap to git_mmap.

This minor cleanup was suggested by Johannes Schindelin.

The mmap is still fake in the sense that we don't support PROT_WRITE
or MAP_SHARED with external modification at all, but that hasn't
stopped us from using mmap() thoughout the Git code.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>

compat/mmap.c

@@ -1,12 +1,12 @@
 #include "../git-compat-util.h"
 
-void *gitfakemmap(void *start, size_t length, int prot , int flags, int fd, off_t offset)
+void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset)
 {
 	int n = 0;
 	off_t current_offset = lseek(fd, 0, SEEK_CUR);
 
 	if (start != NULL || !(flags & MAP_PRIVATE))
-		die("Invalid usage of gitfakemmap.");
+		die("Invalid usage of mmap when built with NO_MMAP");
 
 	if (lseek(fd, offset, SEEK_SET) < 0) {
 		errno = EINVAL;
@@ -44,7 +44,7 @@ void *gitfakemmap(void *start, size_t length, int prot , int flags, int fd, off_
 	return start;
 }
 
-int gitfakemunmap(void *start, size_t length)
+int git_munmap(void *start, size_t length)
 {
 	free(start);
 	return 0;

git-compat-util.h

@@ -87,10 +87,10 @@ extern void set_warn_routine(void (*routine)(const char *warn, va_list params));
 #define MAP_FAILED ((void*)-1)
 #endif
 
-#define mmap gitfakemmap
-#define munmap gitfakemunmap
-extern void *gitfakemmap(void *start, size_t length, int prot , int flags, int fd, off_t offset);
-extern int gitfakemunmap(void *start, size_t length);
+#define mmap git_mmap
+#define munmap git_munmap
+extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
+extern int git_munmap(void *start, size_t length);
 
 #else /* NO_MMAP */