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

diff --git a/remote-curl.c b/remote-curl.c
index ad6a163..d8d276a 100644
--- a/remote-curl.c
+++ b/remote-curl.c
@@ -82,6 +82,7 @@
 	const char *url;
 	struct walker *walker = NULL;
 
+	git_extract_argv0_path(argv[0]);
 	setup_git_directory();
 	if (argc < 2) {
 		fprintf(stderr, "Remote needed\n");