Move to a single clang unknown flags list

Soong is using a single list of unknown clang flags for all
architectures, instead of the per-architecture list here. Collapse this
down to a single list as well so that it can be verified against the
Soong list, and eventually replaced by the Soong version.

Change-Id: If43cd892105da5155907c05965a74b835920a369
diff --git a/core/binary.mk b/core/binary.mk
index 1ef55b3..614b8aa 100644
--- a/core/binary.mk
+++ b/core/binary.mk
@@ -517,8 +517,8 @@
 arm_objects_cflags := $($(LOCAL_2ND_ARCH_VAR_PREFIX)$(my_prefix)$(arm_objects_mode)_CFLAGS)
 normal_objects_cflags := $($(LOCAL_2ND_ARCH_VAR_PREFIX)$(my_prefix)$(normal_objects_mode)_CFLAGS)
 ifeq ($(my_clang),true)
-arm_objects_cflags := $(call $(LOCAL_2ND_ARCH_VAR_PREFIX)convert-to-$(my_host)clang-flags,$(arm_objects_cflags))
-normal_objects_cflags := $(call $(LOCAL_2ND_ARCH_VAR_PREFIX)convert-to-$(my_host)clang-flags,$(normal_objects_cflags))
+arm_objects_cflags := $(call convert-to-clang-flags,$(arm_objects_cflags))
+normal_objects_cflags := $(call convert-to-clang-flags,$(normal_objects_cflags))
 endif
 
 else
@@ -1344,10 +1344,10 @@
 my_cppflags += $(LOCAL_CLANG_CPPFLAGS_$($(my_prefix)$(LOCAL_2ND_ARCH_VAR_PREFIX)ARCH)) $(LOCAL_CLANG_CPPFLAGS_$(my_32_64_bit_suffix))
 my_ldflags += $(LOCAL_CLANG_LDFLAGS_$($(my_prefix)$(LOCAL_2ND_ARCH_VAR_PREFIX)ARCH)) $(LOCAL_CLANG_LDFLAGS_$(my_32_64_bit_suffix))
 my_asflags += $(LOCAL_CLANG_ASFLAGS_$($(my_prefix)$(LOCAL_2ND_ARCH_VAR_PREFIX)ARCH)) $(LOCAL_CLANG_ASFLAGS_$(my_32_64_bit_suffix))
-my_cflags := $(call $(LOCAL_2ND_ARCH_VAR_PREFIX)convert-to-$(my_host)clang-flags,$(my_cflags))
-my_cppflags := $(call $(LOCAL_2ND_ARCH_VAR_PREFIX)convert-to-$(my_host)clang-flags,$(my_cppflags))
-my_asflags := $(call $(LOCAL_2ND_ARCH_VAR_PREFIX)convert-to-$(my_host)clang-flags,$(my_asflags))
-my_ldflags := $(call $(LOCAL_2ND_ARCH_VAR_PREFIX)convert-to-$(my_host)clang-flags,$(my_ldflags))
+my_cflags := $(call convert-to-clang-flags,$(my_cflags))
+my_cppflags := $(call convert-to-clang-flags,$(my_cppflags))
+my_asflags := $(call convert-to-clang-flags,$(my_asflags))
+my_ldflags := $(call convert-to-clang-flags,$(my_ldflags))
 else
 # gcc does not handle hidden functions in a manner compatible with LLVM libcxx
 # see b/27908145