libraries/qt6: Use the internal re2.

Fixes a conflict with the newer re2 on SBo

Signed-off-by: Matteo Bernardini <ponce@slackbuilds.org>

Signed-off-by: Willy Sudiarto Raharjo <willysr@slackbuilds.org>

libraries/qt6/qt6.SlackBuild

@@ -110,6 +110,7 @@ cd build
     -DFEATURE_system_xcb_xinput=$SYSTEM_XCB_INPUT \
     -DFEATURE_webengine_proprietary_codecs=$PROPRIETARY_CODECS \
     -DFEATURE_webengine_system_ffmpeg=$SYSTEM_FFMPEG \
+    -DFEATURE_webengine_system_re2=OFF \
     -DINSTALL_ARCHDATADIR=./lib${LIBDIRSUFFIX} \
     -DINSTALL_BINDIR=./lib${LIBDIRSUFFIX}/$PRGNAM/bin \
     -DINSTALL_DESCRIPTIONSDIR=./lib${LIBDIRSUFFIX}/$PRGNAM/modules \