signbit-sa.c: Add dg-require-effective-target c99_runtime

	* gcc.dg/signbit-sa.c: Add dg-require-effective-target c99_runtime

From-SVN: r221266

gcc/testsuite/ChangeLog

 2015-03-08  John David Anglin  <danglin@gcc.gnu.org>
 
+	* gcc.dg/signbit-sa.c: Add dg-require-effective-target c99_runtime
+
 	* gcc.dg/ipa/pr64307.c: Add target c99_runtime.
 
 	* gcc.dg/ipa/ipa-icf-34.c: Add dg-require-alias.

gcc/testsuite/gcc.dg/signbit-sa.c

 /* Some versions of Solaris <math.h> give strict-aliasing warnings for
    signbit.  */
+/* { dg-require-effective-target c99_runtime } */
 /* { dg-options "-std=c99 -O2 -Wstrict-aliasing" } */
 
 #include <math.h>