Show release-config's stderr

Currently, both stdout and stderr are redirected to a file. We want
stderr to be visible on the terminal in case the release config
fails.

Test: m nothing
Change-Id: I1337718fe8f9394be3017cc8b6d76f8dc1a94ef0
diff --git a/core/release_config.mk b/core/release_config.mk
index 5fe3d39..e3ec3a0 100644
--- a/core/release_config.mk
+++ b/core/release_config.mk
@@ -133,7 +133,7 @@
     _flags_file:=$(OUT_DIR)/soong/release-config/release_config-$(TARGET_PRODUCT)-$(TARGET_RELEASE).vars
     # release-config generates $(_flags_varmk)
     _flags_varmk:=$(_flags_file:.vars=.varmk)
-    $(shell $(OUT_DIR)/release-config $(_args) >$(OUT_DIR)/release-config.out 2>&1 && touch -t 200001010000 $(_flags_varmk))
+    $(shell $(OUT_DIR)/release-config $(_args) >$(OUT_DIR)/release-config.out && touch -t 200001010000 $(_flags_varmk))
     $(if $(filter-out 0,$(.SHELLSTATUS)),$(error release-config failed to run))
     ifneq (,$(_final_product_config_pass))
         # Save the final version of the config.