crt: Don't use FE_* constants in truncl.

In preparation for fenv.h changes that will modify those constants.

Signed-off-by: Jacek Caban <jacek@codeweavers.com>

mingw-w64-crt/math/truncl.c

diff --git a/mingw-w64-crt/math/truncl.c b/mingw-w64-crt/math/truncl.c
index 3b47e53..d1b2966 100644
--- a/mingw-w64-crt/math/truncl.c
+++ b/mingw-w64-crt/math/truncl.c
@@ -3,7 +3,7 @@
  * This file is part of the mingw-w64 runtime package.
  * No warranty is given; refer to the file DISCLAIMER.PD within this package.
  */
-#include <fenv.h>
+
 #include <math.h>
 
 long double
@@ -16,8 +16,7 @@
   unsigned short saved_cw;
   unsigned short tmp_cw;
   __asm__ __volatile__ ("fnstcw %0;" : "=m" (saved_cw)); /* save FPU control word */
-  tmp_cw = (saved_cw & ~(FE_TONEAREST | FE_DOWNWARD | FE_UPWARD | FE_TOWARDZERO))
-	    | FE_TOWARDZERO;
+  tmp_cw = saved_cw | 0xc00; /* round towards zero */
   __asm__ __volatile__ ("fldcw %0;" : : "m" (tmp_cw));
   __asm__ __volatile__ ("frndint;" : "=t" (retval)  : "0" (_x)); /* round towards zero */
   __asm__ __volatile__ ("fldcw %0;" : : "m" (saved_cw) ); /* restore saved control word */