Ensure qmodule.pri is installed.

From the commit message of 0b2ce852

 and
the code in qt_module.prf, it is apparently intended that qmodule.pri is
installed, but this was never implemented correctly.  Make sure we
install it.

This has gone unnoticed because it happens to be installed by accident
unless $$QT_SOURCE_TREE != $$QT_BUILD_TREE and
$$QT_BUILD_TREE != $$[QT_INSTALL_PREFIX] (i.e. a shadow build which is
not using -developer-build).

Change-Id: Iee861a7bb592ca43a61ad91f1ef6a7a5bd21aff8
Reviewed-by: Jyri Tahtela <jyri.tahtela@nokia.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@nokia.com>

qtbase.pro

@@ -77,6 +77,7 @@ unix:!symbian {
 			$(DEL_FILE) src/corelib/global/qconfig.h; \
 			$(DEL_FILE) src/corelib/global/qconfig.cpp; \
 			$(DEL_FILE) mkspecs/qconfig.pri; \
+			$(DEL_FILE) mkspecs/qmodule.pri; \
 			$(DEL_FILE) .qmake.cache; \
  			(cd qmake && $(MAKE) distclean);
 }
@@ -84,6 +85,7 @@ win32 {
   confclean.commands += -$(DEL_FILE) src\\corelib\\global\\qconfig.h $$escape_expand(\\n\\t) \
 			-$(DEL_FILE) src\\corelib\\global\\qconfig.cpp $$escape_expand(\\n\\t) \
 			-$(DEL_FILE) mkspecs\\qconfig.pri $$escape_expand(\\n\\t) \
+			-$(DEL_FILE) mkspecs\\qmodule.pri $$escape_expand(\\n\\t) \
 			-$(DEL_FILE) .qmake.cache $$escape_expand(\\n\\t) \
 			(cd qmake && $(MAKE) distclean)
 }
@@ -97,6 +99,7 @@ symbian {
             -$(DEL_FILE) src\\corelib\\global\\qconfig.h $$escape_expand(\\n\\t) \
             -$(DEL_FILE) src\\corelib\\global\\qconfig.cpp $$escape_expand(\\n\\t) \
             -$(DEL_FILE) mkspecs\\qconfig.pri $$escape_expand(\\n\\t) \
+            -$(DEL_FILE) mkspecs\\qmodule.pri $$escape_expand(\\n\\t) \
             -$(DEL_FILE) .qmake.cache $$escape_expand(\\n\\t) \
             (cd qmake && $(MAKE) distclean)
   } else {
@@ -107,6 +110,7 @@ symbian {
             -$(DEL_FILE) src/corelib/global/qconfig.h $$escape_expand(\\n\\t) \
             -$(DEL_FILE) src/corelib/global/qconfig.cpp $$escape_expand(\\n\\t) \
             -$(DEL_FILE) mkspecs/qconfig.pri $$escape_expand(\\n\\t) \
+            -$(DEL_FILE) mkspecs/qmodule.pri $$escape_expand(\\n\\t) \
             -$(DEL_FILE) .qmake.cache $$escape_expand(\\n\\t) \
             (cd qmake && $(MAKE) distclean)
   }
@@ -142,7 +146,7 @@ INSTALLS += configtests
 
 #mkspecs
 mkspecs.path=$$[QT_INSTALL_DATA]/mkspecs
-mkspecs.files=$$QT_BUILD_TREE/mkspecs/qconfig.pri $$files($$QT_SOURCE_TREE/mkspecs/*)
+mkspecs.files=$$QT_BUILD_TREE/mkspecs/qconfig.pri $$QT_BUILD_TREE/mkspecs/qmodule.pri $$files($$QT_SOURCE_TREE/mkspecs/*)
 mkspecs.files -= $$QT_SOURCE_TREE/mkspecs/modules
 unix { 
    DEFAULT_QMAKESPEC = $$QMAKESPEC