[Mesa-dev] [PATCH] glsl / imports.h: fix MSVC build

[Aras Pranckevicius]

Hi,

Attached patch fixes MSVC (2008) build. MSVC was still missing truncf,
exp2f, log2f (all used in GLSL2).

MSVC does not have trunc(), so defining truncf() to trunc() does not quite
work. The _XOPEN_SOURCE usage looked pretty weird as well; it made whole
that block not be included if the define is not there at all.

-- 
Aras Pranckevičius
work: http://unity3d.com
home: http://aras-p.info
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