Add suffix to linker hack

Author: hmelder

Tests/base/NSURLSession/simpleTaskTests.m

@@ -1,7 +1,7 @@
 #import <Foundation/Foundation.h>
 
 #if defined(__OBJC__) && defined(__clang__) && defined(_MSC_VER)
-id __work_around_clang_bug = @"__unused__";
+id __work_around_clang_bug2 = @"__unused__";
 #endif
 
 #if GS_HAVE_NSURLSESSION

Tests/base/NSURLSession/uploadTaskTests.m

@@ -4,7 +4,7 @@
 #include <Foundation/NSString.h>
 
 #if defined(__OBJC__) && defined(__clang__) && defined(_MSC_VER)
-id __work_around_clang_bug = @"__unused__";
+id __work_around_clang_bug2 = @"__unused__";
 #endif
 
 #if GS_HAVE_NSURLSESSION