configure: GCC: Add -Werror=format-security

Seems like a good idea security-wise. Also distributions
are starting to add that flag by default when building
their packages.



git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@37341 b3059339-0415-0410-9bf9-f77b7e298cf2
gui/win32: Fix wrong usage of format string

Patch-by: Stephen Sheldon >sfsheldo gmail<



git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@37342 b3059339-0415-0410-9bf9-f77b7e298cf2