gir_main plugin: add compatibility with girepository-2.0

fix #765

Author: jorsn

src/plugin/gir_main.c

@@ -4,7 +4,13 @@
  *
  */
 
-# include <girepository.h>
+// compatibility with girepository-1.0 and 2.0
+#if __has_include(<girepository.h>) // girepository-1.0
+  #include <girepository.h>
+  #define gi_repository_get_option_group g_irepository_get_option_group
+#else
+  #include <girepository/girepository.h>
+#endif
 
 # include "astroid_activatable.h"
 
@@ -14,7 +20,7 @@ int main (int argc, char ** argv) {
   GError *error = NULL;
 
   ctx = g_option_context_new (NULL);
-  g_option_context_add_group (ctx, g_irepository_get_option_group ());
+  g_option_context_add_group (ctx, gi_repository_get_option_group ());
 
   if (!g_option_context_parse (ctx, &argc, &argv, &error)) {
     g_print ("astroid girmain: %s\n", error->message);