do-extract: don't add layer for Macintosh and php metadata

Some softwares insisted on have some manifest in top-level directory,
like package.xml for php packages. Some other packages was zipped on
macOS, which will insert some macOS metadata files into zoom.

See-also: dc73556cf3 and its parents.
See-also: 94fe74e506

Those files doesn't justify the need of adding a layer automatically
in extraction step.

Let's move them up.

common/hooks/do-extract/00-distfiles.sh

@@ -178,6 +178,26 @@ hook() {
 			esac
 		fi
 	done
+	# Special case for num_dirs = 2, and it contains metadata
+	if [ "$num_dirs" != 2 ] || [ "$create_wrksrc" ]; then
+		:
+	elif grep -q 'xmlns="http://pear[.]php[.]net/dtd/package' package.xml 2>/dev/null
+	then
+		# PHP modules' metadata
+		rm -f package.xml
+		for f in */; do innerdir="$f"; done
+		num_dirs=1
+	else
+		for f in *; do
+			# AppleDouble encoded Macintosh file
+			if [ -e "$f" ] && [ -e "._$f" ]; then
+				rm -f "._$f"
+				num_dirs=1
+				innerdir="$f"
+				break
+			fi
+		done
+	fi
 	rm -rf "$wrksrc"
 	innerdir="$extractdir/$innerdir"
 	cd "$XBPS_BUILDDIR"