Don't test linguist macros if cross compiling.

linguist tools are not bootstrapped.

Change-Id: Iae6b577db17be788a04036a06238191aa6896c01
Reviewed-by: Rohan McGovern <rohan.mcgovern@nokia.com>
Reviewed-by: Stephen Kelly <stephen.kelly@kdab.com>

tests/auto/cmake/CMakeLists.txt

@@ -29,7 +29,9 @@ find_package(Qt5Core REQUIRED)
 
 include("${_Qt5CTestMacros}")
 
-expect_pass(test_translation_macros)
+if(NOT CMAKE_CROSSCOMPILING)
+    expect_pass(test_translation_macros)
+endif()
 
 find_package(Qt5Widgets)
 if (Qt5Widgets_FOUND)