build: Add variable printing target to Makefiles

I kept finding myself needing these to debug our build system, since
they are innocuous and are very helpful they probably belong in the
codebase.

Source: John Graham-Cumming
https://www.cmcrossroads.com/article/printing-value-makefile-variable

depends/Makefile

@@ -1,5 +1,9 @@
 .NOTPARALLEL :
 
+# Pattern rule to print variables, e.g. make print-top_srcdir
+print-%:
+	@echo $* = $($*)
+
 SOURCES_PATH ?= $(BASEDIR)/sources
 WORK_PATH = $(BASEDIR)/work
 BASE_CACHE ?= $(BASEDIR)/built