clew: move this foreign code to external/clew

... so that hopefully it won't be "cleaned up" and needlessly diverge
from any hypothetical future upstream.

Change-Id: I10503072f618ac6b74bc52d4d59c0d8951bd8d0d
Reviewed-on: https://gerrit.libreoffice.org/23075
Reviewed-by: David Ostrovsky <david@ostrovsky.org>
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Michael Stahl <mstahl@redhat.com>

RepositoryModule_host.mk

@@ -34,7 +34,6 @@ $(eval $(call gb_Module_add_moduledirs,libreoffice,\
 	bridges \
 	canvas \
 	chart2 \
-	$(call gb_Helper_optional,OPENCL,clew) \
 	cli_ure \
 	$(call gb_Helper_optional,DESKTOP,codemaker) \
 	comphelper \

external/Module_external.mk

@@ -29,6 +29,7 @@ $(eval $(call gb_Module_add_moduledirs,external,\
 	$(call gb_Helper_optional,BZIP2,bzip2) \
 	$(call gb_Helper_optional,CAIRO,cairo) \
 	$(call gb_Helper_optional,CDR,libcdr) \
+	$(call gb_Helper_optional,OPENCL,clew) \
 	$(call gb_Helper_optional,CLUCENE,clucene) \
 	$(call gb_Helper_optional,CMIS,libcmis) \
 	$(call gb_Helper_optional,COINMP,coinmp) \

external/clew/Library_clew.mk

@@ -27,7 +27,7 @@ $(eval $(call gb_Library_add_libs,clew,\
 endif
 
 $(eval $(call gb_Library_add_cobjects,clew,\
-    clew/source/clew \
+    external/clew/source/clew \
 ))
 
 # This is required for module-deps.pl to produce correct dependencies.

external/clew/Makefile

@@ -2,6 +2,6 @@
 
 module_directory:=$(dir $(realpath $(firstword $(MAKEFILE_LIST))))
 
-include $(module_directory)/../solenv/gbuild/partial_build.mk
+include $(module_directory)/../../solenv/gbuild/partial_build.mk
 
 # vim: set noet sw=4 ts=4:

external/clew/README

@@ -0,0 +1,5 @@
+CLEW is the OpenCL Extension Wrangler - similar to GLEW but for OpenCL
+
+This project doesn't appear to have an obvious upstream, so
+the source files are in our git repo and there is no option
+to use a system library.