qmake: Fix name of header-only modules when doing simulator builds.

This solves an issue where header only modules in a simulator build with
frameworks on Apple platforms would result in a module like
"QtZlib_iphonesimulator.framework" being created. This patch removes
the "_iphonesimulator" infix from the name.

Change-Id: I60e818042d776cc6ac430413ccea1be1a1a1e48b
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>

mkspecs/features/qt_module.prf

@@ -113,6 +113,7 @@ lib_bundle {
    CONFIG += sliced_bundle
    header_module {
         CONFIG += bundle
+        QMAKE_BUNDLE_NAME = $$TARGET
         QMAKE_BUNDLE_EXTENSION = .framework
         QMAKE_INFO_PLIST = $$QMAKESPEC/Info.plist.lib
    }