Use GCC for compiling ICU4C on MIPS64.

Clang on MIPS64 miscompiles ICU4C. Resort to GCC
until Clang gets fixed on MIPS64.

Change-Id: I94845a59b675a2ace4e0e47a3fa35a3c4a985584
diff --git a/icu4c/source/common/Android.mk b/icu4c/source/common/Android.mk
index a8bab99..8eddfad 100644
--- a/icu4c/source/common/Android.mk
+++ b/icu4c/source/common/Android.mk
@@ -151,7 +151,9 @@
 LOCAL_ADDITIONAL_DEPENDENCIES += $(LOCAL_PATH)/Android.mk
 LOCAL_REQUIRED_MODULES += icu-data
 LOCAL_EXPORT_C_INCLUDE_DIRS := $(LOCAL_PATH)
+ifneq ($(TARGET_ARCH),mips64)
 LOCAL_CLANG := true
+endif
 include $(BUILD_SHARED_LIBRARY)
 
 #
@@ -191,5 +193,7 @@
 LOCAL_MODULE := libicuuc_static
 LOCAL_SRC_FILES += $(src_files)
 LOCAL_REQUIRED_MODULES += icu-data
+ifneq ($(TARGET_ARCH),mips64)
 LOCAL_CLANG := true
+endif
 include $(BUILD_STATIC_LIBRARY)