libfec: fix Mac build

Exclude the host library and executables on Mac.

Change-Id: Ie399b83f3678d16aac67ce9a4414344a93f90055

Author: samitolvanen

libfec/Android.mk

@@ -38,6 +38,8 @@ LOCAL_STATIC_LIBRARIES := \
     $(common_static_libraries)
 include $(BUILD_STATIC_LIBRARY)
 
+ifeq ($(HOST_OS),linux)
+
 include $(CLEAR_VARS)
 LOCAL_CFLAGS := $(common_cflags) -D_GNU_SOURCE -DFEC_NO_KLOG
 LOCAL_C_INCLUDES := $(common_c_includes)
@@ -53,4 +55,6 @@ LOCAL_STATIC_LIBRARIES := \
     $(common_static_libraries)
 include $(BUILD_HOST_STATIC_LIBRARY)
 
+endif # HOST_OS == linux
+
 include $(LOCAL_PATH)/test/Android.mk

libfec/test/Android.mk

@@ -1,5 +1,7 @@
 LOCAL_PATH:= $(call my-dir)
 
+ifeq ($(HOST_OS),linux)
+
 include $(CLEAR_VARS)
 LOCAL_CLANG := true
 LOCAL_SANITIZE := integer
@@ -26,3 +28,5 @@ LOCAL_STATIC_LIBRARIES := libfec_rs_host
 LOCAL_CFLAGS := -Wall -Werror -D_GNU_SOURCE
 LOCAL_C_INCLUDES += external/fec
 include $(BUILD_HOST_EXECUTABLE)
+
+endif # HOST_OS == linux