cmake: blacklist xlib test, we can just use X11_FOUND

Change-Id: Ic733c42e11b00fa8bf107f460a0596aeb10ac37b
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>

src/gui/configure.cmake

@@ -400,25 +400,7 @@ glProgramUniform1i(0, 0, 0);
 }
 ")
 
-# xlib
-qt_config_compile_test(xlib
-    LABEL "XLib"
-    LIBRARIES X11::X11
-    CODE
-"
-#include <X11/Xlib.h>
 
-int main(int argc, char **argv)
-{
-    (void)argc; (void)argv;
-    /* BEGIN TEST: */
-Display *d = XOpenDisplay(NULL);
-XCloseDisplay(d);
-    /* END TEST: */
-    return 0;
-}
-"
-)
 
 #### Features
 
@@ -734,7 +716,7 @@ qt_feature("xkbcommon_evdev" PRIVATE
 qt_feature("xlib" PRIVATE
     LABEL "XLib"
     AUTODETECT NOT APPLE OR QT_FEATURE_xcb
-    CONDITION TEST_xlib
+    CONDITION X11_FOUND
 )
 qt_feature("texthtmlparser" PUBLIC
     SECTION "Kernel"

util/cmake/configurejson2cmake.py

@@ -187,6 +187,7 @@ def map_tests(test: str) -> str:
         'reduce_exports': 'CMAKE_CXX_COMPILE_OPTIONS_VISIBILITY',
 
         'libinput_axis_api': 'ON',
+        "xlib": "X11_FOUND",
     }
     if test in testmap:
         return testmap.get(test, None)
@@ -550,6 +551,7 @@ def parseTest(ctx, test, data, cm_fh):
        'separate_debug_info',  # FIXME: see if cmake can do this
        'gc_binaries',
        'libinput_axis_api',
+       'xlib',
     }
 
     if test in skip_tests: