Dump more BUILD_BROKEN_* values out to log

This is useful when determining which devices are setting which values
from the logs, cross-referencing where warnings still occur.

Test: look at out/soong.log
Change-Id: I3e3f0e4c8cbd9ce621b03f5163eff2cccfa8c424
diff --git a/ui/build/dumpvars.go b/ui/build/dumpvars.go
index 05314cb..8429a8a 100644
--- a/ui/build/dumpvars.go
+++ b/ui/build/dumpvars.go
@@ -162,6 +162,11 @@
 
 		// Whether --werror_overriding_commands will work
 		"BUILD_BROKEN_DUP_RULES",
+
+		// Not used, but useful to be in the soong.log
+		"BUILD_BROKEN_ANDROIDMK_EXPORTS",
+		"BUILD_BROKEN_DUP_COPY_HEADERS",
+		"BUILD_BROKEN_PHONY_TARGETS",
 	}, exportEnvVars...), BannerVars...)
 
 	make_vars, err := dumpMakeVars(ctx, config, config.Arguments(), allVars, true)