servo: Merge #8518 - Silence the "Nothing to be done for 'all'." message (from servo:shhhhh-make); r=larsbergstrom

r? @larsbergstrom

Source-Repo: https://github.com/servo/servo
Source-Revision: 8c3d2235287767180180290622f9f259e821330c

servo/support/android/openssl.makefile

@@ -1,5 +1,6 @@
 .PHONY: all
 all: openssl
+	@:  # No-op to silence the "make: Nothing to be done for 'all'." message.
 
 # From http://wiki.openssl.org/index.php/Android
 .PHONY: openssl