testsuite: add missing dg-require-effective-target fpic

Require effective target fpic for newly added test.

gcc/testsuite/
	* g++.dg/ext/visibility/visibility-local-extern1.C: Add missing
	dg-require-effective-target fpic.

gcc/testsuite/g++.dg/ext/visibility/visibility-local-extern1.C

 // PR c++/103291
 // { dg-additional-options -fpic }
 // { dg-final { scan-assembler-not "@GOTPCREL" } }
+// { dg-require-effective-target fpic }
 
 #pragma GCC visibility push(hidden)