tests: make a few globals statics

ld was warning that the size of path changed, rightly so.

tests-clar/network/urlparse.c

 #include "clar_libgit2.h"
 #include "netops.h"
 
-char *host, *port, *path, *user, *pass;
-gitno_connection_data conndata;
+static char *host, *port, *path, *user, *pass;
+static gitno_connection_data conndata;
 
 void test_network_urlparse__initialize(void)
 {

tests-clar/repo/config.c

@@ -2,7 +2,7 @@
 #include "fileops.h"
 #include <ctype.h>
 
-git_buf path = GIT_BUF_INIT;
+static git_buf path = GIT_BUF_INIT;
 
 void test_repo_config__initialize(void)
 {