newapkbuild: add empty line after builddir= and quote whole value

newapkbuild.in

@@ -193,7 +193,6 @@ makedepends="$makedepends"
 install="$install"
 subpackages="\$pkgname-dev \$pkgname-doc"
 source="$source"
-
 __EOF__
 
 	abuild -f fetch unpack
@@ -202,10 +201,9 @@ __EOF__
 		if [ -d "$i" ]; then
 			sdir=$i
 			builddir=$(echo ${i#*/} | sed "s/$pv/\$pkgver/g")
-			builddir="\"\$srcdir\"/$builddir"
 		fi
 	done
-	echo "builddir=$builddir" >> APKBUILD
+	printf 'builddir="$srcdir/%s"\n\n' "$builddir" >> APKBUILD
 
 	# Subpackage -dev is usually required only for C/C++. Since depends_dev
 	# confuses a lot people, remove it if there's no .h or .hpp file.