remote-curl: add missing initialization of argv0_path

All programs, in particular also the stand-alone programs (non-builtins)
must call git_extract_argv0_path(argv[0]) in order to help builds that
derive the installation prefix at runtime, such as the MinGW build.
Without this call, the program segfaults (or raises an assertion
failure).

Signed-off-by: Johannes Sixt <j6t@kdbg.org>
Tested-by: Michael Wookey <michaelwookey@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

remote-curl.c

@@ -82,6 +82,7 @@ int main(int argc, const char **argv)
 	const char *url;
 	struct walker *walker = NULL;
 
+	git_extract_argv0_path(argv[0]);
 	setup_git_directory();
 	if (argc < 2) {
 		fprintf(stderr, "Remote needed\n");