Clang 3.8 is clean of warnings

Change-Id: Ibc83b9f7e3bc4962ae35ffff1425c8e686579e15
Reviewed-by: Jake Petroules <jake.petroules@theqtcompany.com>

mkspecs/features/qt_common.prf

@@ -50,10 +50,10 @@ warnings_are_errors:warning_clean {
     # compiler.
     clang:!ios {
         # Apple clang 4.0-4.2,5.0-5.1,6.0-6.4
-        # Regular clang 3.3-3.7
+        # Regular clang 3.3-3.8
         apple_ver = $${QT_APPLE_CLANG_MAJOR_VERSION}.$${QT_APPLE_CLANG_MINOR_VERSION}
         reg_ver = $${QT_CLANG_MAJOR_VERSION}.$${QT_CLANG_MINOR_VERSION}
-        contains(apple_ver, "4\\.[012]|5\\.[01]|6\\.[01234]")|contains(reg_ver, "3\\.[3-7]") {
+        contains(apple_ver, "4\\.[012]|5\\.[01]|6\\.[01234]")|contains(reg_ver, "3\\.[3-8]") {
             QMAKE_CXXFLAGS_WARN_ON += -Werror -Wno-error=\\$${LITERAL_HASH}warnings -Wno-error=deprecated-declarations $$WERROR
         }
     } else:intel_icc:linux {