Build rule updates for aosp

Various build rule changes to match AOSP:
Add libunwind_llvm and libdl as dependencies for libc++ on device
Always add libcompiler_rt-extras as a dependency
Add libm, libc, and libdl as depnendencies for libc++ static binaries
Disable some clang warnings, and add some clang filtered cflags
Add -fstack-protector to host linux builds
Add jack_flags property to java modules (currently ignored)

Change-Id: Ic0da617bdeaf25f58cb8298dd9ea91b7d6509151
diff --git a/java/java.go b/java/java.go
index d9aad3c..d22f47a 100644
--- a/java/java.go
+++ b/java/java.go
@@ -65,6 +65,9 @@
 		// javacflags: list of module-specific flags that will be used for javac compiles
 		Javacflags []string `android:"arch_variant"`
 
+		// jack_flags: list of module-specific flags that will be used for jack compiles
+		Jack_flags []string `android:"arch_variant"`
+
 		// dxflags: list of module-specific flags that will be used for dex compiles
 		Dxflags []string `android:"arch_variant"`