Make inline function __comps_objmrtree_all also static (RhBug:1793424)

The function isn't used anywhere else and doesn't have any other
external definition present in any other translation unit (which is
causing a compiler error).

https://bugzilla.redhat.com/show_bug.cgi?id=1793424

libcomps/src/comps_objmradix.c

@@ -605,7 +605,7 @@ inline void comps_objmrtree_pair_destroy_v(void * pair) {
     free(pair);
 }
 
-inline COMPS_HSList* __comps_objmrtree_all(COMPS_ObjMRTree * rt, char keyvalpair) {
+static inline COMPS_HSList* __comps_objmrtree_all(COMPS_ObjMRTree * rt, char keyvalpair) {
     COMPS_HSList *to_process, *ret;
     COMPS_HSListItem *hsit, *oldit;
     size_t x;