K 10
svn:author
V 3
pfg
K 8
svn:date
V 27
2015-08-28T14:06:28.494012Z
K 7
svn:log
V 401
Be more GCC-friendly with attributes

Being clang the default compiler, we were always giving precedence to
the __has_attribute check. Unfortunately clang generally doesn't support
the new attributes (alloc_size was briefly supported and then reverted)
so we were always doing both checks. Give the precedence to GCC as that is
the working case now.

Do the same for  __has_builtin() for consistency.

END