Cosmin Truta 7e18d14296 ci: Add the targets/ subdirectory to facilitate cross-platform testing
Considering that a non-trivial amount of libpng code is arch-specific,
we should perform cross-platform builds (with cross-platform toolchains)
and test runs (on emulated architectures) in our routine verification.

The content of ci/targets/ shall consist of target description files,
written in the standard shell language. These files may be source'd as
needed, before running the verification scripts ci/ci_verify_*.sh.

Here is the initial list of target systems:
Android, Cygwin, FreeBSD, Linux, MSDOS, Windows.

And here is the initial list of target architectures:
ARM, MIPS, PowerPC, RISC-V, x86.
2024-09-05 22:23:30 +03:00
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