Provide better QMAKE_RPATHDIR defaults on Apple platforms

Now QMAKE_RPATHDIR also includes @executable_path and @loader_path
on Apple platforms, and omits any others on iOS, tvOS, and watchOS
since they can't use paths outside the application bundle.

Change-Id: Ia8f76ebcddd51f44eca482a51ce1710369c8df10
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>

mkspecs/common/uikit.conf

@@ -3,7 +3,7 @@
 #
 
 QMAKE_PLATFORM         += uikit
-CONFIG                 += bitcode reduce_exports shallow_bundle
+CONFIG                 += bitcode reduce_exports shallow_bundle no_qt_rpath
 
 INCLUDEPATH            += $$PWD/uikit
 DEFINES                += DARWIN_NO_CARBON QT_NO_PRINTER QT_NO_PRINTDIALOG

mkspecs/features/mac/default_post.prf

@@ -24,6 +24,13 @@ qt {
     }
 }
 
+# Add the same default rpaths as Xcode does for new projects.
+# This is especially important for iOS/tvOS/watchOS where no other option is possible.
+!no_default_rpath {
+    QMAKE_RPATHDIR += @executable_path/Frameworks
+    equals(TEMPLATE, lib):!plugin:lib_bundle: QMAKE_RPATHDIR += @loader_path/Frameworks
+}
+
 macx-xcode:!isEmpty(QMAKE_XCODE_DEBUG_INFORMATION_FORMAT) {
     debug_information_format.name = DEBUG_INFORMATION_FORMAT
     debug_information_format.value = $$QMAKE_XCODE_DEBUG_INFORMATION_FORMAT