feat: update gcc builds to 10/08/2026 - #238
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Pin each GCC version to the newest gcc-builds release that publishes it: 14.3.0, 15.2.0 and 16.1.0 move to 08072026, and 16.2.0 is added from 10082026 as the new default. 12.5.0 and 13.4.0 stay on 18082025, which remains the only release building them. The 08072026 release started prefixing the x86_64 binaries in bin/ with the x86_64-linux- target triple, where earlier releases left them unprefixed, so a single hardcoded prefix can no longer serve every pinned version. Resolve the prefix from the extracted toolchain instead, probing for bin/<triple>-as: the unprefixed layout ships prefixed aliases for gcc, g++, c++ and gfortran, but never for as. Passing binary_prefix explicitly still overrides detection.
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Pin each GCC version to the newest gcc-builds release that publishes it: 14.3.0, 15.2.0 and 16.1.0 move to 08072026, and 16.2.0 is added from 10082026 as the new default. 12.5.0 and 13.4.0 stay on 18082025, which remains the only release building them.
The 08072026 release started prefixing the x86_64 binaries in bin/ with the x86_64-linux- target triple, where earlier releases left them unprefixed, so a single hardcoded prefix can no longer serve every pinned version. Resolve the prefix from the extracted toolchain instead, probing for bin/-as: the unprefixed layout ships prefixed aliases for gcc, g++, c++ and gfortran, but never for as. Passing binary_prefix explicitly still overrides detection.