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Build Linux binaries using icc

Leo P. Singer requested to merge leo-singer/ligo.skymap:icc into master

Switch from using the GNU Compiler Collection (gcc) to the Intel C Compiler (icc) for building optimized Linux binaries. On Intel Skylake machines, this can speed up BAYESTAR by 1.3x or more.

Due to icc's C ABI requirements, Linux wheels now target the manylinux2010 platform tag.

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