sdktool: Use shell_quote for data path define

Change-Id: Idc0e2945133123941afa0ab92e5ff57dedf8f4ba
Reviewed-by: Iikka Eklund <iikka.eklund@qt.io>
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/tools/sdktool/sdktool.pro

@@ -78,6 +78,6 @@ appversion.output = $$OUT_PWD/app/app_version.h
 QMAKE_SUBSTITUTES += appversion
 INCLUDEPATH += $$OUT_PWD
 
-macx:DEFINES += "DATA_PATH=\"\\\".\\\"\""
-else:win32:DEFINES += "DATA_PATH=\"\\\"../share/qtcreator\\\"\""
-else:DEFINES += "DATA_PATH=\"\\\"../../share/qtcreator\\\"\""
+macos:DEFINES += $$shell_quote(DATA_PATH=\".\")
+else:win32:DEFINES += $$shell_quote(DATA_PATH=\"../share/qtcreator\")
+else:DEFINES += $$shell_quote(DATA_PATH=\"../../share/qtcreator\")