Remove unnecessary CLANG_CONFIG_EXTRA_*_C_INCLUDES variables.

These aren't needed now that we only use the compiler/headers that exist in
the prebuilts/clang directory.

Change-Id: I9978efb10815e92577d45629db324e0a5094f880
diff --git a/core/binary.mk b/core/binary.mk
index ae01860..55d6f94 100644
--- a/core/binary.mk
+++ b/core/binary.mk
@@ -315,7 +315,6 @@
 my_target_global_cflags := $($(LOCAL_2ND_ARCH_VAR_PREFIX)CLANG_TARGET_GLOBAL_CFLAGS)
 my_target_global_cppflags += $($(LOCAL_2ND_ARCH_VAR_PREFIX)CLANG_TARGET_GLOBAL_CPPFLAGS)
 my_target_global_ldflags := $($(LOCAL_2ND_ARCH_VAR_PREFIX)CLANG_TARGET_GLOBAL_LDFLAGS)
-my_target_c_includes += $(CLANG_CONFIG_EXTRA_TARGET_C_INCLUDES)
 else
 my_target_global_cflags := $($(LOCAL_2ND_ARCH_VAR_PREFIX)TARGET_GLOBAL_CFLAGS)
 my_target_global_cppflags += $($(LOCAL_2ND_ARCH_VAR_PREFIX)TARGET_GLOBAL_CPPFLAGS)
@@ -359,7 +358,7 @@
 my_host_global_cflags := $($(LOCAL_2ND_ARCH_VAR_PREFIX)CLANG_HOST_GLOBAL_CFLAGS)
 my_host_global_cppflags := $($(LOCAL_2ND_ARCH_VAR_PREFIX)CLANG_HOST_GLOBAL_CPPFLAGS)
 my_host_global_ldflags := $($(LOCAL_2ND_ARCH_VAR_PREFIX)CLANG_HOST_GLOBAL_LDFLAGS)
-my_host_c_includes := $($(LOCAL_2ND_ARCH_VAR_PREFIX)HOST_C_INCLUDES) $(CLANG_CONFIG_EXTRA_HOST_C_INCLUDES)
+my_host_c_includes := $($(LOCAL_2ND_ARCH_VAR_PREFIX)HOST_C_INCLUDES)
 else
 my_host_global_cflags := $($(LOCAL_2ND_ARCH_VAR_PREFIX)HOST_GLOBAL_CFLAGS)
 my_host_global_cppflags := $($(LOCAL_2ND_ARCH_VAR_PREFIX)HOST_GLOBAL_CPPFLAGS)