feat: support building on FreeBSD#86
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Accept FreeBSD in the CMake OS check and reuse the existing POSIX socket path (src/linux/). Two source portability fixes make that path compile on FreeBSD: - endian: FreeBSD provides the byte-order helpers via <sys/endian.h> rather than glibc's <endian.h>. - SOL_TCP: use the portable POSIX IPPROTO_TCP for TCP-level setsockopt options; SOL_TCP is a Linux-only alias (equal to IPPROTO_TCP there). Also rename the MGCLIENT_ON_LINUX macro/CMake variable to MGCLIENT_ON_POSIX, since Linux and FreeBSD now share that build path. Verified: static and shared libraries build with clang on FreeBSD 14.
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Accept FreeBSD in the CMake OS check and reuse the existing POSIX socket path (src/linux/). Two source portability fixes make that path compile on FreeBSD:
rather than glibc's <endian.h>.
Also rename the MGCLIENT_ON_LINUX macro/CMake variable to MGCLIENT_ON_POSIX, since Linux and FreeBSD now share that build path.
Verified: static and shared libraries build with clang on FreeBSD 14.