Xcode 4.3 compatibility checkin

The Xcode 4.3 compiler will only accept %z (lower case), and considers
%Z to be an invalid format specifier.

This patch adds a preprocessor conditional to provide a %z version of
the formatting strings when the Xcode 4.3 compiler is used.

Change-Id: I742a7832caa4b757240f206c1e09736bfc10d9e2
Signed-off-by: Al Sutton <al@funkyandroid.com>

Conflicts:
	libs/rs/rsFifoSocket.cpp