Revert "makepkg: Empty/create only $pkgdir's relevant to current PKGBUILD"

This reverts commit f9423cfa5d.

This created issue when building packages with debug info multiple times.
It could be fixed, but it confirmed my initial opinion that keeping other
directories in $pkgdirbase was wrong. Use different BUILDDIRs if you want
to build different things from a single PKGBUILD.

scripts/makepkg.sh.in

@@ -2223,13 +2223,10 @@ if (( NOBUILD )); then
 	msg "$(gettext "Sources are ready.")"
 	exit 0 #E_OK
 else
-	# clean existing pkg directories
+	# clean existing pkg directory
 	if [[ -d $pkgdirbase ]]; then
 		msg "$(gettext "Removing existing %s directory...")" "\$pkgdir/"
-		for pkg in "${pkgname[@]}"; do
-			rm -rf "$pkgdirbase/$pkg"
-		done
-		unset pkg
+		rm -rf "$pkgdirbase"
 	fi
 	mkdir -p "$pkgdirbase"
 	chmod a-srw "$pkgdirbase"