Blame .gitignore

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SOURCES/doxygen-1.8.0.src.tar.gz
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SOURCES/gcc-10.2.1-20200804.tar.xz
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SOURCES/gmp-6.1.0.tar.bz2
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SOURCES/isl-0.16.1.tar.bz2
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SOURCES/mpc-1.0.3.tar.gz
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SOURCES/mpfr-3.1.4.tar.bz2