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build: fix mingw-w64 builds with ASM enabled #32

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Fixes:

ld.lld: error: undefined symbol: fiat_p256_adx_mul
>>> referenced by libcrypto.a(bcm.o):(fiat_p256_mul)
ld.lld: error: undefined symbol: fiat_p256_adx_sqr
>>> referenced by libcrypto.a(bcm.o):(fiat_p256_square)

All Windows builds use NASM. NASM sources miss the implementation for
these functions. Yet they are referenced for all GCC x86_64 builds,
which includes mingw-64.

Disable these references for mingw-64 to make the build succeed.

Fixes:
```
ld.lld: error: undefined symbol: fiat_p256_adx_mul
>>> referenced by libcrypto.a(bcm.o):(fiat_p256_mul)
ld.lld: error: undefined symbol: fiat_p256_adx_sqr
>>> referenced by libcrypto.a(bcm.o):(fiat_p256_square)
```

All Windows builds use NASM. NASM sources miss the implementation for
these functions. Yet they are referenced for all GCC x86_64 builds,
which includes mingw-64.

Disable these references for mingw-64 to make the build succeed.
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@vszakats
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vszakats commented Oct 26, 2024

It's a trivial patch fixing a build regression. Please accept it as-is or as an issue report. Also feel free to commit via a CLA-blessed user.

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