Cycles: Post-reintegration tweaks to ensure things do compile

This commit contains all the tweaks which were missing in initial patch
re-integration from the standalone Cycles repository.

This commit also contains an utility cmake macro to help linking targets
with different libraries for release/debug builds, the name currently is

  target_link_libraries_decoupled

it gets a target and list of libraries and makes sure debug builds are
using libraries with "_d" suffix.

After all this changes it'll hopefully be easier to interchange patches
between blender and standalone repositories, because they're now quite
identical.

build_files/cmake/macros.cmake

@@ -118,6 +118,19 @@ macro(target_link_libraries_debug TARGET LIBS)
 	unset(_LIB)
 endmacro()
 
+macro(target_link_libraries_decoupled target libraries_var)
+	if(NOT MSVC)
+		target_link_libraries(${target} ${${libraries_var}})
+	else()
+		# For MSVC we link to different libraries depending whether
+		# release or debug target is being built.
+		file_list_suffix(_libraries_debug "${${libraries_var}}" "_d")
+		target_link_libraries_debug(${target} "${_libraries_debug}")
+		target_link_libraries_optimized(${target} "${${libraries_var}}")
+		unset(_libraries_debug)
+	endif()
+endmacro()
+
 # Nicer makefiles with -I/1/foo/ instead of -I/1/2/3/../../foo/
 # use it instead of include_directories()
 macro(blender_include_dirs