UnitTest: Fix build with clang 3.9.1

llvm-config-3.9 --cxxflags has -g1 which is substituted by 1.

Change-Id: I626f3f15c659f7de030c08883b5b739b1d636ada
Reviewed-by: Marco Bubke <marco.bubke@qt.io>

tests/unit/unittest/clang_dependency.pri

@@ -20,7 +20,7 @@ win32 {
 LIBS += $$LIBTOOLING_LIBS $$LIBCLANG_LIBS
 QMAKE_RPATHDIR += $$LLVM_LIBDIR
 
-LLVM_CXXFLAGS ~= s,-g,
+LLVM_CXXFLAGS ~= s,-g\d?,
 QMAKE_CXXFLAGS += $$LLVM_CXXFLAGS
 }