Work around glibc stuff (use standard functions for this stuff)

Index: lib/common/fltfenv.c
--- lib/common/fltfenv.c.orig
+++ lib/common/fltfenv.c
@@ -560,7 +560,7 @@ __fenv_feupdateenv(fenv_t *env)
  * __fenv_mask_fz() and __fenv_restore_fz().
  */
 
-#include <fpu_control.h>
+#include <fenv.h>
 
 /** \brief Set (flush to zero) underflow mode
  *
@@ -570,14 +570,14 @@ __fenv_feupdateenv(fenv_t *env)
 int
 __fenv_fesetzerodenorm(int uflow)
 {
-  uint64_t cw;
+  fenv_t cw;
 
-  _FPU_GETCW(cw);
+  fegetenv(&cw);
   if (uflow)
     cw |= (1ULL << 24);
   else
     cw &= ~(1ULL << 24);
-  _FPU_SETCW(cw);
+  fesetenv(&cw);
   return 0;
 }
 
@@ -588,9 +588,9 @@ __fenv_fesetzerodenorm(int uflow)
 int
 __fenv_fegetzerodenorm(void)
 {
-  uint64_t cw;
+  fenv_t cw;
 
-  _FPU_GETCW(cw);
+  fegetenv(&cw);
   return (cw & (1ULL << 24)) ? 1 : 0;
 }
 
@@ -605,16 +605,16 @@ __fenv_fegetzerodenorm(void)
 void
 __fenv_mask_fz(int mask, int *psv)
 {
-  uint64_t tmp;
+  fenv_t tmp;
 
-  _FPU_GETCW(tmp);
+  fegetenv(&tmp);
   if (psv)
     *psv = ((tmp & (1ULL << 24)) ? 1 : 0);
   if (mask)
     tmp |= (1ULL << 24);
   else
     tmp &= ~(1ULL << 24);
-  _FPU_SETCW(tmp);
+  fesetenv(&tmp);
 }
 
 /** \brief
@@ -623,14 +623,14 @@ __fenv_mask_fz(int mask, int *psv)
 void
 __fenv_restore_fz(int sv)
 {
-  uint64_t tmp;
+  fenv_t tmp;
 
-  _FPU_GETCW(tmp);
+  fegetenv(&tmp);
   if (sv)
     tmp |= (1ULL << 24);
   else
     tmp &= ~(1ULL << 24);
-  _FPU_SETCW(tmp);
+  fesetenv(&tmp);
 }
 
 #else