Enable trace feature for CAF. This comes in handy debugging messaging.

caf/Makefile

@@ -17,7 +17,7 @@ impl:
 	echo patch CMakeLists.txt ../caf-cmakefile.patch && \
 	mkdir -p build && \
 	pushd build && \
-	cmake  -DCMAKE_INSTALL_PREFIX=$$PWD/caf_out .. && \
+	cmake  -DCAF_LOG_LEVEL=TRACE -DCMAKE_INSTALL_PREFIX=$$PWD/caf_out .. && \
 	DO_NOT_SPECIFY_CMAKE_CXX_FLAGS_HERE="" make -j $$(nproc) && \
 	make install