[patch] Check for libffi_cv_as_x86_pcrel should not look for just "warning"

[Rafael Avila de Espindola <respindola@mozilla.com>]

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The check that sets libffi_cv_as_x86_pcrel currently check for "warning" 
or "illegal". The problem is that when trying to build libffi with LTO 
clang will produce the warning

clang: warning: argument unused during compilation: '-emit-llvm'

The attached patch just uses the $CC error code instead. Is that OK or 
is there some strange assembler out there that rejects the assembly bug 
exists with 0?

Cheers,
Rafael

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diff --git a/configure b/configure
index e086c65..a1c5ec8 100755
--- a/configure
+++ b/configure
@@ -14506,10 +14506,10 @@ if test "${libffi_cv_as_x86_pcrel+set}" = set; then
   $as_echo_n "(cached) " >&6
 else
 
-	libffi_cv_as_x86_pcrel=yes
+	libffi_cv_as_x86_pcrel=no
 	echo '.text; foo: nop; .data; .long foo-.; .text' > conftest.s
-	if $CC $CFLAGS -c conftest.s 2>&1 | $EGREP -i 'illegal|warning' > /dev/null; then
-	    libffi_cv_as_x86_pcrel=no
+	if $CC $CFLAGS -c conftest.s > /dev/null; then
+	    libffi_cv_as_x86_pcrel=yes
 	fi
 
 fi
diff --git a/configure.ac b/configure.ac
index c7cead8..c12c858 100644
--- a/configure.ac
+++ b/configure.ac
@@ -276,10 +276,10 @@ fi
 if test x$TARGET = xX86 || test x$TARGET = xX86_WIN32 || test x$TARGET = xX86_64; then
     AC_CACHE_CHECK([assembler supports pc related relocs],
 	libffi_cv_as_x86_pcrel, [
-	libffi_cv_as_x86_pcrel=yes
+	libffi_cv_as_x86_pcrel=no
 	echo '.text; foo: nop; .data; .long foo-.; .text' > conftest.s
-	if $CC $CFLAGS -c conftest.s 2>&1 | $EGREP -i 'illegal|warning' > /dev/null; then
-	    libffi_cv_as_x86_pcrel=no
+	if $CC $CFLAGS -c conftest.s > /dev/null; then
+	    libffi_cv_as_x86_pcrel=yes
 	fi
 	])
     if test "x$libffi_cv_as_x86_pcrel" = xyes; then