buteo-mtp, libqtsparql: fixes -isystem directories order for GCC 6 to find stdlib.h

recipes-nemomobile/buteo/buteo-mtp_git.bb

@@ -12,6 +12,8 @@ PV = "+git${SRCREV}"
 S = "${WORKDIR}/git"
 inherit qmake5
 
+EXTRA_QMAKEVARS_PRE += "QMAKE_CFLAGS_ISYSTEM="
+
 do_configure_prepend() {
     sed -i "s@contextkit-statefs@contextkit-statefs contextsubscriber-1.0@" ${S}/mts/common.pri
     sed -i "s@buteosyncfw5@buteosyncfw5 contextsubscriber-1.0@" ${S}/service/service.pro

recipes-nemomobile/libqtsparql/libqtsparql_git.bb

@@ -10,12 +10,15 @@ PV = "+git${SRCREV}"
 S = "${WORKDIR}/git"
 inherit qmake5
 
+EXTRA_QMAKEVARS_PRE += "QMAKE_CFLAGS_ISYSTEM="
+
 DEPENDS += "qtbase qtdeclarative"
 
 do_configure_prepend() {
     ./configure -prefix /usr/
     sed -i "s@src tests examples@src@" projects.pro
     sed -i "/doc.pri/d" projects.pro
+    export QT_SELECT=5
 }
 
 do_install_append() {