Fix compilation on OpenBSD

[riscygeek]

On OpenBSD for Non-POSIX functions (like vasprintf() and swap16()) to be defined,
it requires defining _BSD_SOURCE.

Otherwise the build fails to compile, or compiles successfully and fails when linking against zlib-ng.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.03 ⚠️

Comparison is base (c4c1c7f) 83.15% compared to head (2dbae15) 83.12%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1466      +/-   ##
===========================================
- Coverage    83.15%   83.12%   -0.03%     
===========================================
  Files          130      130              
  Lines        10759    10675      -84     
  Branches      2760     2739      -21     
===========================================
- Hits          8947     8874      -73     
+ Misses        1136     1135       -1     
+ Partials       676      666      -10     

Flag	Coverage Δ
macos_clang	42.97% <ø> (ø)
macos_gcc	72.97% <ø> (ø)
ubuntu_clang	82.25% <ø> (ø)
ubuntu_clang_debug	81.92% <ø> (ø)
ubuntu_clang_inflate_allow_invalid_dist	81.91% <ø> (ø)
ubuntu_clang_inflate_strict	82.24% <ø> (ø)
ubuntu_clang_mmap	82.34% <ø> (-0.23%)	⬇️
ubuntu_clang_pigz	14.15% <ø> (+0.05%)	⬆️
ubuntu_clang_pigz_no_optim	11.56% <ø> (ø)
ubuntu_clang_pigz_no_threads	13.97% <ø> (ø)
ubuntu_clang_reduced_mem	82.74% <ø> (+0.22%)	⬆️
ubuntu_gcc	74.49% <ø> (+0.07%)	⬆️
ubuntu_gcc_aarch64	76.66% <ø> (ø)
ubuntu_gcc_aarch64_compat_no_opt	75.00% <ø> (ø)
ubuntu_gcc_aarch64_no_acle	75.56% <ø> (ø)
ubuntu_gcc_aarch64_no_neon	75.55% <ø> (ø)
ubuntu_gcc_armhf	76.74% <ø> (ø)
ubuntu_gcc_armhf_compat_no_opt	74.97% <ø> (-0.02%)	⬇️
ubuntu_gcc_armhf_no_acle	76.69% <ø> (ø)
ubuntu_gcc_armhf_no_neon	76.57% <ø> (ø)
ubuntu_gcc_armsf	74.04% <ø> (ø)
ubuntu_gcc_armsf_compat_no_opt	73.51% <ø> (ø)
ubuntu_gcc_benchmark	73.17% <ø> (ø)
ubuntu_gcc_compat_no_opt	76.07% <ø> (-0.02%)	⬇️
ubuntu_gcc_compat_sprefix	73.19% <ø> (+0.15%)	⬆️
ubuntu_gcc_m32	72.68% <ø> (ø)
ubuntu_gcc_mingw_i686	72.92% <ø> (-0.16%)	⬇️
ubuntu_gcc_mingw_x86_64	73.07% <ø> (ø)
ubuntu_gcc_no_avx2	73.65% <ø> (ø)
ubuntu_gcc_no_ctz	74.09% <ø> (ø)
ubuntu_gcc_no_ctzll	74.11% <ø> (ø)
ubuntu_gcc_no_pclmulqdq	73.65% <ø> (ø)
ubuntu_gcc_no_sse2	73.81% <ø> (ø)
ubuntu_gcc_no_sse4	73.56% <ø> (ø)
ubuntu_gcc_o1	73.43% <ø> (-0.06%)	⬇️
ubuntu_gcc_osb	∅ <ø> (∅)
ubuntu_gcc_pigz	38.34% <ø> (-0.03%)	⬇️
ubuntu_gcc_pigz_aarch64	39.28% <ø> (+0.05%)	⬆️
ubuntu_gcc_ppc	73.32% <ø> (ø)
ubuntu_gcc_ppc64	73.78% <ø> (ø)
ubuntu_gcc_ppc64le	73.87% <ø> (ø)
ubuntu_gcc_ppc_no_power8	74.00% <ø> (ø)
ubuntu_gcc_s390x	74.19% <ø> (ø)
ubuntu_gcc_s390x_dfltcc	71.39% <ø> (ø)
ubuntu_gcc_s390x_dfltcc_compat	?
ubuntu_gcc_s390x_no_crc32	73.98% <ø> (ø)
ubuntu_gcc_sparc64	74.22% <ø> (ø)
ubuntu_gcc_sprefix	72.69% <ø> (-0.16%)	⬇️
win64_gcc	73.38% <ø> (+0.04%)	⬆️
win64_gcc_compat_no_opt	74.15% <ø> (ø)

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see 9 files with indirect coverage changes

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