Update INSTALL.md to ensure AVX2 and AV512 support for python package

[lranon1]

Following the current documentation creates the python package without AVX2 or AV512 support. Updated documentation notes that corresponding faiss version must be built before swigfaiss.

fixes #3883

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[asadoughi]

Thanks!

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@asadoughi merged this pull request in 09bffd2.