Make sure Harfbuzz build picks up Qt atomics

We have our own implementation of the atomics API in Harfbuzz
for broader platform support. This is done through the mechanism
in Harfbuzz where you make a file called config.h with the
implementation and then define HAVE_CONFIG_H.

In Qt, we have this in src/3rdparty/harfbuzz-ng/config.h,
next to the CMakeLists.txt.

However, on some platforms, a different config.h has been found
earlier in the include paths and included instead, causing us to
use the default atomic implementation instead on these platforms.

This causes problems with the upgrade to Harfbuzz 11, where the
atomics have been written to depend on some template syntax which
is not properly supported on the Integrity OS compilers yet.

This was also a random inconsistency, so rather than try to work
around the compile issue on Integrity, we add the CMakeLists.txt
directory as the first include path, to make sure the correct
config.h is picked up on all platforms.

Pick-to: 6.8 6.5
Change-Id: I5fc2d57e740ea0a59700ebe319213fe716f8490e
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
(cherry picked from commit 66fae045cd289e2f1525c7c4e4ce7a3069ec97ee)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

src/3rdparty/harfbuzz-ng/CMakeLists.txt

@@ -76,8 +76,8 @@ qt_internal_add_3rdparty_library(BundledHarfbuzz
         HB_NO_UNICODE_FUNCS
         QT_NO_VERSION_TAGGING
     INCLUDE_DIRECTORIES
-        $<TARGET_PROPERTY:Core,INCLUDE_DIRECTORIES>
         "${CMAKE_CURRENT_SOURCE_DIR}"
+        $<TARGET_PROPERTY:Core,INCLUDE_DIRECTORIES>
     PUBLIC_INCLUDE_DIRECTORIES
         $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include/harfbuzz>
 )