Mesa (master): util: Fix MinGW build.

[Jose Fonseca]

Module: Mesa
Branch: master
Commit: a922d3413f99ec384ed23324a4cceade8ab57e34
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=a922d3413f99ec384ed23324a4cceade8ab57e34

Author: José Fonseca <jfonseca at vmware.com>
Date:   Wed Oct  9 21:17:53 2013 -0700

util: Fix MinGW build.

_GNU_SOURCE appears to not be used reliably.  Use _MSC_VER instead so
that MSVC alone is affected.

---

 src/gallium/auxiliary/util/u_math.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/src/gallium/auxiliary/util/u_math.h b/src/gallium/auxiliary/util/u_math.h
index 3005349..f5c14ef 100644
--- a/src/gallium/auxiliary/util/u_math.h
+++ b/src/gallium/auxiliary/util/u_math.h
@@ -162,7 +162,7 @@ float log2f(float f)
 #endif
 
 
-#if __STDC_VERSION__ < 199901L && (!defined(__cplusplus) || !defined(_GNU_SOURCE))
+#if __STDC_VERSION__ < 199901L && (!defined(__cplusplus) || defined(_MSC_VER))
 static INLINE long int
 lrint(double d)
 {