Fix PHONY uses found by --warn_real_to_phony
Switch a use of `ndk` to the timestamp file that `ndk` depends on
itself.
Mark more module-specific rules as PHONY.
Test: diff build-aosp_arm.ninja (stripping _kati_always_build_)
Test: Turn on --warn_real_to_phony for Kati, see fewer warnings
Change-Id: I101ced4067780e38d18820f5d916596429087e49
diff --git a/core/Makefile b/core/Makefile
index 1161e4d..a5109f0 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -2917,7 +2917,7 @@
# -----------------------------------------------------------------
# NDK Sysroot Package
NDK_SYSROOT_TARGET := $(PRODUCT_OUT)/ndk_sysroot.tar.bz2
-$(NDK_SYSROOT_TARGET): ndk
+$(NDK_SYSROOT_TARGET): $(SOONG_OUT_DIR)/ndk.timestamp
@echo Package NDK sysroot...
$(hide) tar cjf $@ -C $(SOONG_OUT_DIR) ndk