Enable test building for VxWorks with qtbase

This enables blocking test building.

Pick-to: 6.7
Change-Id: I184bd16a1c6a0ec45bfd9ee9b96c478dd2cf7c33
Reviewed-by: Toni Saario <toni.saario@qt.io>
(cherry picked from commit 71d8f797ba)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

coin/platform_configs/cmake_platforms_qemu_vxworks_buildtest.yaml

@@ -0,0 +1,15 @@
+Version: 2
+Configurations:
+-
+    Id: 'vxworks-imx6-buildtest'
+    Template: 'qtci-linux-Ubuntu-22.04-x86_64-51'
+    Target os: 'VxWorks'
+    Target arch: 'ARMv7'
+    Compiler: 'Clang'
+    Target compiler: 'Clang'
+    Platform dependency: 'ubuntu-22.04'
+    Features: ['VMSize8', 'UseConfigure', 'DoNotRunTests', 'DoNotUploadTests']
+    Environment variables: [
+        'TARGET_CONFIGURE_ARGS=-release -developer-build -force-debug-info -qpa eglfs -nomake examples',
+        'TARGET_CMAKE_ARGS=-DBUILD_SHARED_LIBS=OFF -DWARNINGS_ARE_ERRORS=OFF -DCMAKE_TOOLCHAIN_FILE="{{.Env.WIND_CC_SYSROOT}}/mk/rtp.toolchain.cmake" -DFEATURE_vulkan=OFF -DQT_QMAKE_TARGET_MKSPEC=vxworks-clang -DQT_HOST_PATH=/home/qt/work/install -DCMAKE_AUTOGEN_VERBOSE=ON -DCMAKE_STAGING_PREFIX:PATH=/home/qt/work/install/target'
+    ]

coin/platform_configs/qtbase.yaml

@@ -7,7 +7,7 @@ Include: [
     address_sanitizer_platforms.yaml,
     linux_android_tests_multi_abi.yaml,
     wasm_qtbase_tests.yaml,
-    cmake_platforms_qemu_vxworks.yaml,
+    cmake_platforms_qemu_vxworks_buildtest.yaml,
     qtlite.yaml,
     qtbase-new-compiler-testing.yaml
 ]