include,auxiliary: Remove support for MSVC older then 2008.

MSVC 2008 (shipped with Windows SDK 7.0.7600) is the oldest we
need to support.  At least on llvmpipe, gallium/auxiliary, and util
modules.  For the remaining modules (particular all OpenGL specific
code) can be built with MSVC 2013.

Reviewed-by: Brian Paul <brianp@vmware.com>
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
diff --git a/include/c99_compat.h b/include/c99_compat.h
index e5d0ae4..f56f6f3 100644
--- a/include/c99_compat.h
+++ b/include/c99_compat.h
@@ -33,6 +33,11 @@
  * MSVC hacks.
  */
 #if defined(_MSC_VER)
+
+#  if _MSC_VER < 1500
+#    error "Microsoft Visual Studio 2008 or higher required"
+#  endif
+
    /*
     * Visual Studio 2012 will complain if we define the `inline` keyword, but
     * actually it only supports the keyword on C++.
@@ -116,11 +121,7 @@
 #  elif defined(__GNUC__)
 #    define __func__ __FUNCTION__
 #  elif defined(_MSC_VER)
-#    if _MSC_VER >= 1300
-#      define __func__ __FUNCTION__
-#    else
-#      define __func__ "<unknown>"
-#    endif
+#    define __func__ __FUNCTION__
 #  else
 #    define __func__ "<unknown>"
 #  endif