Allow mutliple triplets for install command about cppbuildtasks HOT 3 CLOSED

@lukka Thanks for your support.

I tried

libmodbus:x86-windows
libmodbus:x64-windows

and it works just as I expected. It picked up x86-windows as default triplet (because I provided non).

I am not sure why I did not tried it out directly. Probably I was a bit confused by you examples as they all used the syntax with one triplet. Enhancing the documentation by some response files would be good.

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@smkanadl added more documentation about usage of triplet and its default.

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@smkanadl
have not tried the scenario with multiple triplets yet, but it could just be working already.

Could you verify whether a response like this would work:

sqlite3:x64-osx
sqlite3:x86-osx
libmodbus:x86-osx
libmodbus
zlib
--triplet
x64-osx

For all the ports that have no specified triplet, the one specified by --triplet will be used, that is you will get installed the following ports:

libmodbus:x64-osx
libmodbus:x86-osx
sqlite3:x64-osx
sqlite3:x86-osx
zlib:x64-osx   

If this is not working, let's try to propose a possible solution. All I have in mind right now is that the run-vcpkg task should not enforce any '--triplet' argument unless it is provided in the vcpkgTriplet task parameter (so it is up to the user to pass it or not).

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