Remove the rest of showcommands, dist goal

showcommands is all handled in soong_ui, make/kati/ninja never see the
argument.

Remove the dist goal, since we'll never pass it to ninja, only to Kati
as a modifier.

Remove DUMP_%, since that's not used anywhere (it appears to be in our
code search via the NDK build system)

Test: m -j showcommands dist
Change-Id: I0d1498128caece685e98c2c2b5b0c3f545da0e11
diff --git a/core/config.mk b/core/config.mk
index 42f6148..cdc90e5 100644
--- a/core/config.mk
+++ b/core/config.mk
@@ -129,11 +129,7 @@
 # Parse out any modifier targets.
 # ###############################################################
 
-# The 'showcommands' goal says to show the full command
-# lines being executed, instead of a short message about
-# the kind of operation being done.
-SHOW_COMMANDS:= $(filter showcommands,$(MAKECMDGOALS))
-hide := $(if $(SHOW_COMMANDS),,@)
+hide := @
 
 ################################################################
 # Tools needed in product configuration makefiles.