makepkg: add missing newline from libprovides output

This was a small oversight from 1917c845 which causes makepkg to write
provides entries to the .PKGINFO file improperly, e.g.

  provides = systemdlibsystemdudev=999

Add a newline in the printf format to ensure that these are spaced
appropriately.

Signed-off-by: Dave Reisner <dreisner@archlinux.org>
Signed-off-by: Dan McGee <dan@archlinux.org>

scripts/makepkg.sh.in

@@ -1145,7 +1145,7 @@ find_libprovides() {
 		fi
 	done
 
-	printf "%s" "${libprovides[@]}"
+	printf '%s\n' "${libprovides[@]}"
 }
 
 check_license() {