OP-483: move Windows installer out of ground/gcs tree

In preparation for release build the Windows installer source is moved
out of ground/gcs source tree into release directory. It is also disabled
in the qmake source file and removed from top level Makefile.

Makefile

@@ -270,18 +270,6 @@ openpilotgcs:  uavobjects_gcs
 	  $(MAKE) -w ; \
 	)
 
-.PHONY: gcs_installer
-gcs_installer: openpilotgcs
-ifeq ($(QT_SPEC), win32-g++)
-ifeq ($(GCS_BUILD_CONF), release)
-	$(V1) cd $(BUILD_DIR)/ground/openpilotgcs/packaging/winx86 && $(MAKE) -r --no-print-directory $@
-else
-	$(error $@ can be generated for release build only (GCS_BUILD_CONF=release))
-endif
-else
-	$(error $@ is currently only available on Windows)
-endif
-
 .PHONY: openpilotgcs_clean
 openpilotgcs_clean:
 	$(V0) @echo " CLEAN     $@"

ground/openpilotgcs/packaging/packaging.pro

@@ -1,7 +1,6 @@
 include(../openpilotgcs.pri)
 
 TEMPLATE = subdirs
-SUBDIRS = winx86
 
 # Copy Qt runtime libraries into the build directory (to run or package)
 equals(copydata, 1) {

release/Makefile.winx86

@@ -2,10 +2,9 @@
 # Windows-specific packaging
 #
 
-# Generate GCS installer
-gcs_installer: uavobjects
+gcs: uavobjects
 	$(V1) $(MAKE) -C $(ROOT_DIR) GCS_BUILD_CONF=release $@
 
-ground_package: | gcs_installer
+ground_package: | gcs
 
-.PHONY: gcs_installer ground_package
+.PHONY: gcs ground_package