abuild: fix finding pkg-config deps in subpackages

We strip version from pkg-config dependency when scanning the
subpackages.

abuild.in

@@ -999,7 +999,8 @@ subpkg_provides_so() {
 }
 
 subpkg_provides_pc() {
-	grep -q -w "^$1" "$pkgbasedir"/.control.*/.provides-pc 2>/dev/null
+	grep -q -w "^${1%%[<>=]*}" "$pkgbasedir"/.control.*/.provides-pc \
+		2>/dev/null
 }
 
 trace_apk_deps() {