[gmp] build failure on wasm32-emscripten

[LeenHawk]

Operating system

Linux (Debian Sid WSL)

Compiler

Emscripten emcc 3.1.43

Steps to reproduce the behavior

`./vcpkg install gmp --triplet=wasm32-emscripten`

Failure logs

config-wasm32-emscripten-dbg-out.log
config-wasm32-emscripten-dbg-config.log
config-wasm32-emscripten-dbg-err.log

Additional context

build gmp with emscripten works well like below:

wget https://gmplib.org/download/gmp/gmp-6.2.1.tar.xz
tar -xf gmp-6.2.1.tar.xz
cd gmp-6.2.1
emconfigure ./configure --disable-assembly --enable-cxx --host=none --with-pic --with-readline=no --disable-silent-rules --verbose --disable-shared --enable-static
emmake make

So, I guess it failed because vcpkg use configure but not set well with emscripten env variable. (I have tried add --host=none and change enable-assembly=no in profile.cmake, it doesn't work.)

[LeenHawk]

I guess wasm32-emscripten setting is not same to emconfigure setting for configure project...

[xiaozhuai]

Reproduced on macOS with EMSDK 3.1.44

[dg0yt]

I'm not convinced that emconfigure adds a lot which we don't already have. But we have a vcpkg_configure_make which is known to not pass enough flags for some targets. And fixing that isn't accept yet, #31228.

[github-actions]

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