Rename protoc to aprotoc.
Rename protoc to aprotoc.

With gLucid protoc is installed in the base system, by renaming
our version there will be no confusion about which compiler is
being used.

Change-Id: I975e29e4444af9467c9b9600d5a2e7027f4046ae

VanirAOSP/external_protobuf,geekboxzone/lollipop_external_protobuf,geekboxzone/mmallow_external_protobuf,cubieboard/openbox_external_protobuf,VanirAOSP/external_protobuf,Evervolv/android_external_protobuf,MonkeyZZZZ/platform_external_protobuf,CyanogenMod/android_external_protobuf,geekboxzone/lollipop_external_protobuf,android-ia/platform_external_protobuf,xin3liang/platform_external_protobuf,xin3liang/platform_external_protobuf,VanirAOSP/external_protobuf,xin3liang/platform_external_protobuf,geekboxzone/mmallow_external_protobuf,cubieboard/openbox_external_protobuf,MonkeyZZZZ/platform_external_protobuf,geekboxzone/lollipop_external_protobuf,cubieboard/openbox_external_protobuf,ThirdProject/android_external_protobuf,xin3liang/platform_external_protobuf,ThirdProject/android_external_protobuf,VanirAOSP/external_protobuf,Evervolv/android_external_protobuf,ThirdProject/android_external_protobuf,geekboxzone/mmallow_external_protobuf,VanirAOSP/external_protobuf,cubieboard/openbox_external_protobuf,MonkeyZZZZ/platform_external_protobuf,Evervolv/android_external_protobuf,MonkeyZZZZ/platform_external_protobuf,geekboxzone/mmallow_external_protobuf,Evervolv/android_external_protobuf,CyanogenMod/android_external_protobuf,CyanogenMod/android_external_protobuf,cubieboard/openbox_external_protobuf,android-ia/platform_external_protobuf,MonkeyZZZZ/platform_external_protobuf,ThirdProject/android_external_protobuf,geekboxzone/lollipop_external_protobuf,CyanogenMod/android_external_protobuf,geekboxzone/mmallow_external_protobuf,xin3liang/platform_external_protobuf,android-ia/platform_external_protobuf,CyanogenMod/android_external_protobuf,android-ia/platform_external_protobuf,Evervolv/android_external_protobuf,geekboxzone/lollipop_external_protobuf