ndk build for opcode.inc has cross-ABI dependency

[dneto0]

From @AWoloszyn comment on #188

"""
I'm willing to let this go, but it does create a fairly strange build dependency, because now for the arm64 build depends on the x86 opcode.inc file.

The only thing I can thing that would solve this is as part of your build do something like copy $(SPVTOOLS_LOCAL_PATH)/source/opcode.cpp -> $(1)/opcode.cpp and change your build to use that opcode.cpp instead of $(SPVTOOLS_LOCAL_PATH)/source/opcode.cpp.

Then arm64 would only depend on arm64 stuff. However that is very complicated, and I don't think will actually make any difference in practice.
"""

[dneto0]

I suggested: How about adding a fake-ish target in between:

$(SPVTOOLS_LOCAL_PATH)/source/opcode.cpp : $(1)/opcode.inc.$(APP_ABI)
$(1)/opcode.inc.$(APP_ABI) : $(1)/opcode.inc
     touch $@

[dneto0]

I was misunderstanding what the issue was. There is no functional failure with the existing solution. It's just that because the makefile is processed once for each ABI, you'll get more messages and possibly more recompiles than you might expect.
This is not important enough to fix. Closing.