include: Add fenv.h header.

include/Makefile.in

@@ -444,6 +444,7 @@ SOURCES = \
 	msvcrt/eh.h \
 	msvcrt/errno.h \
 	msvcrt/fcntl.h \
+	msvcrt/fenv.h \
 	msvcrt/float.h \
 	msvcrt/fpieee.h \
 	msvcrt/inttypes.h \

include/msvcrt/fenv.h

+/**
+ * This file has no copyright assigned and is placed in the Public Domain.
+ * This file is part of the Wine project.
+ */
+
+#ifndef _INC_FENV
+#define _INC_FENV
+
+#include <float.h>
+
+#define FE_TONEAREST   _RC_NEAR
+#define FE_UPWARD      _RC_UP
+#define FE_DOWNWARD    _RC_DOWN
+#define FE_TOWARDZERO  _RC_CHOP
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+_ACRTIMP int __cdecl fesetround(int);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _INC_FENV */