fix lcms2 library in solver

This commit repairs broken link liblcms2.so -> liblcms2.so.2.0.4 as
liblcms2.so -> liblcms2.so.2.

Change-Id: Idccd65bba5cec822d285859f609e222c84f2fad9

lcms2/ExternalPackage_lcms2.mk

@@ -26,7 +26,7 @@ $(eval $(call gb_ExternalPackage_add_file,lcms2,lib/lcms2$(if $(MSVC_USE_DEBUG_R
 $(eval $(call gb_ExternalPackage_add_library_for_install,lcms2,bin/lcms2.dll,bin/lcms2$(if $(MSVC_USE_DEBUG_RUNTIME),d).dll))
 endif
 else
-$(eval $(call gb_ExternalPackage_add_file,lcms2,lib/liblcms2.so,src/.libs/liblcms2.so))
+$(eval $(call gb_ExternalPackage_add_symbolic_link,lcms2,lib/liblcms2.so,liblcms2.so.2))
 $(eval $(call gb_ExternalPackage_add_library_for_install,lcms2,lib/liblcms2.so.2,src/.libs/liblcms2.so.2.0.4))
 endif
 # vim: set noet sw=4 ts=4:

solenv/gbuild/ExternalPackage.mk

@@ -102,6 +102,11 @@ $(foreach file,$(2),$(call gb_ExternalProject_mark_generated_file,$(1),$(file)))
 
 endef
 
+define gb_ExternalPackage_add_symbolic_link
+$(call gb_Package_add_symbolic_link,$(1),$(2),$(3))
+
+endef
+
 # Add a file
 #
 # See gb_Package_add_file for details.