ART: remove gcc cruft from the makefiles

ART only builds with clang now, delete all logic to determine gcc
vs. clang, and move all LOCAL_CLANG_CFLAGS into LOCAL_CFLAGS.

Test: mma, make test-art-host, make test-art-target
Change-Id: I578615233ad3e71af18afb47bb11f3be8417216c
diff --git a/compiler/Android.mk b/compiler/Android.mk
index 0b7bd9c..8261a87 100644
--- a/compiler/Android.mk
+++ b/compiler/Android.mk
@@ -252,13 +252,12 @@
 
   LOCAL_CFLAGS := $$(LIBART_COMPILER_CFLAGS)
   ifeq ($$(art_target_or_host),target)
-    $(call set-target-local-clang-vars)
+    LOCAL_CLANG := $(ART_TARGET_CLANG)
     $(call set-target-local-cflags-vars,$(2))
   else # host
     LOCAL_CLANG := $(ART_HOST_CLANG)
     LOCAL_CFLAGS += $(ART_HOST_CFLAGS)
     LOCAL_ASFLAGS += $(ART_HOST_ASFLAGS)
-    LOCAL_LDLIBS := $(ART_HOST_LDLIBS)
     ifeq ($$(art_static_or_shared),static)
       LOCAL_LDFLAGS += -static
     endif