Don't check source package provides against installed conflicts

Fixes a regression introduced by commit
75ec16e: the newly added provides of
to-be-built packages end up being matched against installed packages
during build dependency checking. Which obviously doesn't make any sense,

Explicitly skip checks against source provides, similarly to what we
already did with obsoletes.

Fixes: #1189

lib/depends.c

@@ -1040,17 +1040,17 @@ int rpmtsCheck(rpmts ts)
 	checkDS(ts, dcache, p, rpmteNEVRA(p), rpmteDS(p, RPMTAG_OBSOLETENAME),
 		tscolor);
 
+	/* Skip obsoletion and provide conflict checks for source packages (ie build) */
+	if (rpmteIsSource(p))
+	    continue;
+
 	/* Check provides against conflicts in installed packages. */
 	while (rpmdsNext(provides) >= 0) {
 	    checkInstDeps(ts, dcache, p, RPMTAG_CONFLICTNAME, NULL, provides, 0);
 	    if (reqnothash && depexistsHashHasEntry(reqnothash, rpmdsNId(provides)))
 		checkInstDeps(ts, dcache, p, RPMTAG_REQUIRENAME, NULL, provides, 1);
 	}
 
-	/* Skip obsoletion checks for source packages (ie build) */
-	if (rpmteIsSource(p))
-	    continue;
-
 	/* Check package name (not provides!) against installed obsoletes */
 	checkInstDeps(ts, dcache, p, RPMTAG_OBSOLETENAME, NULL, rpmteDS(p, RPMTAG_NAME), 0);