Added /pgp libver command

tests/pgp/stub_gpg.c

@@ -1,7 +1,13 @@
 #include <glib.h>
 
 void p_gpg_init(void) {}
+
 GSList* p_gpg_list_keys(void)
 {
     return NULL;
 }
+
+const char* p_gpg_libver(void) {
+    return NULL;
+}
+