QGCExternalLibs: Test Qt version before adding AirMap

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

QGCExternalLibs.pri

@@ -153,6 +153,7 @@ contains (DEFINES, DISABLE_AIRMAP) {
     message("Skipping support for AirMap (manual override from user_config.pri)")
 } else {
     AIRMAPD_PATH = $$PWD/libs/airmapd
+    contains(QT_VERSION, ˆ5\\.11\..*) {
         MacBuild {
             exists($${AIRMAPD_PATH}/macOS/Qt.5.11.0) {
                 message("Including support for AirMap for macOS")
@@ -168,6 +169,7 @@ contains (DEFINES, DISABLE_AIRMAP) {
         } else {
             message("Skipping support for Airmap (unsupported platform)")
         }
+    }
     contains (DEFINES, QGC_AIRMAP_ENABLED) {
         INCLUDEPATH += \
             $${AIRMAPD_PATH}/include