Remove SOONG, SOONG_BUILD_NINJA, SOONG_IN_MAKE and SOONG_BOOTSTRAP.
These variables appear to be unused since Nougat, when Soong was
invoked through Make. This is no longer the case, since soong_build is
now invoked through soong_ui.
https://cs.android.com/android/platform/superproject/+/android-7.1.2_r36:build/core/soong.mk
Test: TH presubmit
Change-Id: I1cfe63144d559fa0da0e54474ed1e36fb3fa0555
diff --git a/core/soong_config.mk b/core/soong_config.mk
index 809a4d6..06b5555 100644
--- a/core/soong_config.mk
+++ b/core/soong_config.mk
@@ -1,7 +1,3 @@
-SOONG := $(SOONG_OUT_DIR)/soong
-SOONG_BOOTSTRAP := $(SOONG_OUT_DIR)/.soong.bootstrap
-SOONG_BUILD_NINJA := $(SOONG_OUT_DIR)/build.ninja
-SOONG_IN_MAKE := $(SOONG_OUT_DIR)/.soong.in_make
SOONG_MAKEVARS_MK := $(SOONG_OUT_DIR)/make_vars-$(TARGET_PRODUCT).mk
SOONG_VARIABLES := $(SOONG_OUT_DIR)/soong.variables
SOONG_ANDROID_MK := $(SOONG_OUT_DIR)/Android-$(TARGET_PRODUCT).mk