Fix for libGL building problems

[Joe Krahn]

In extras/Mesa/src/glx/x11/, some functions from compsize.c were moved 
to indirect_size.c. Some of these are implemented as function aliases, 
which does not work correctly under Cygwin. Cygwin uses these in 
Xserver/GL/windows/. This might be a problem in some other cases as 
well, but it works to add a !defined(__CYGWIN__) in indirect_size.c and 
indirect_size.h like this (I don't have CVS write access):

#  if (__GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 95)) && 
!defined(__CYGWIN__)
#    define HAVE_ALIAS
#  endif

I also noticed the inclusion of a visibility attribute based on the GCC 
version. Cygwin (and others?) does not support this either, but it is 
less critical because it seems to only cause "attribute ignored" warnings.

Joe Krahn

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