remove git_install_prefix()

git_install_prefix() is no longer needed.  Relocatable
paths are searched relative to git_exec_dir().

This commit removes git_install_prefix().

Signed-off-by: Steffen Prohaska <prohaska@zib.de>

cache.h

@@ -391,7 +391,6 @@ static inline int is_dev_null(const char *str)
 const char *make_absolute_path(const char *path);
 /* Convert slashes in place. On Windows to backslashes. */
 char *make_native_separator(char *path);
-const char *git_install_prefix();
 
 /* Read and unpack a sha1 file into memory, write memory to a sha1 file */
 extern int sha1_object_info(const unsigned char *, unsigned long *);

path.c

@@ -359,41 +359,6 @@ const char *make_absolute_path(const char *path)
 	return buf;
 }
 
-const char* git_install_prefix()
-{
-#ifdef __MINGW32__
-	static char* prefix;
-
-	if (prefix) {
-		return prefix;
-	}
-
-	char* p;
-	int pgm_len = strlen(_pgmptr);
-	prefix = xmalloc(pgm_len + 1);
-	strcpy(prefix, _pgmptr);
-	p = strrchr(prefix, '\\'); /* <gitroot>\bin\ <- p */
-	if (p) {
-		*p = '\0';
-		p = strrchr(prefix, '\\'); /* <gitroot>\ <- p */
-		if (p) {
-			*p = '\0';
-			for (p = prefix; *p; p++)
-				if (*p == '\\')
-					*p = '/';
-			return prefix;
-		}
-	}
-
-	/* Note, according to the msdn documentation we have a full path
-	   if started through the shell and this error should never happen. */
-	fprintf(stderr, "Fatal Error: failed to locate installation root.\n");
-	exit(1);
-#else
-	return "";
-#endif
-}
-
 char *make_native_separator(char* path) {
 #ifdef __MINGW32__
 	char* c;