Apply a fix similar to upstream commit 5d1ccdda7b0c625751661d50977f3dfbc73f8eae
to the installed header file.  Upstream, the header file has been removed
in its uncorrected state, so there is no upstream fix to backport.

Suggested by Jakub Jelinek.

diff --git a/sysdeps/x86/fpu/bits/fenv.h b/sysdeps/x86/fpu/bits/fenv.h
index 4103982d8c8ae014..4ae2d2a04c6754bd 100644
--- a/sysdeps/x86/fpu/bits/fenv.h
+++ b/sysdeps/x86/fpu/bits/fenv.h
@@ -132,7 +132,7 @@ __NTH (__feraiseexcept_invalid_divbyzero (int __excepts))
       float __f = 0.0;
 
 # ifdef __SSE_MATH__
-      __asm__ __volatile__ ("divss %0, %0 " : : "x" (__f));
+      __asm__ __volatile__ ("divss %0, %0 " : "+x" (__f));
 # else
       __asm__ __volatile__ ("fdiv %%st, %%st(0); fwait"
 			    : "=t" (__f) : "0" (__f));
@@ -145,7 +145,7 @@ __NTH (__feraiseexcept_invalid_divbyzero (int __excepts))
       float __g = 0.0;
 
 # ifdef __SSE_MATH__
-      __asm__ __volatile__ ("divss %1, %0" : : "x" (__f), "x" (__g));
+      __asm__ __volatile__ ("divss %1, %0" : "+x" (__f) : "x" (__g));
 # else
       __asm__ __volatile__ ("fdivp %%st, %%st(1); fwait"
 			    : "=t" (__f) : "0" (__f), "u" (__g) : "st(1)");