Reintroduce Z_SOLO support for compatibility mode.

[mtl1979]

See #943.

[codecov]

Codecov Report

Merging #944 (0a73167) into develop (1cdd7df) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #944   +/-   ##
========================================
  Coverage    77.42%   77.42%           
========================================
  Files           74       74           
  Lines         8307     8307           
  Branches      1373     1374    +1     
========================================
  Hits          6432     6432           
  Misses        1346     1346           
  Partials       529      529           

Flag	Coverage Δ
macos_clang	68.55% <ø> (ø)
macos_gcc	67.45% <ø> (ø)
ubuntu_clang	73.41% <ø> (ø)
ubuntu_clang_debug	73.71% <ø> (ø)
ubuntu_clang_inflate_allow_invalid_dist	73.14% <ø> (ø)
ubuntu_clang_inflate_strict	73.40% <ø> (ø)
ubuntu_clang_mmap	73.11% <ø> (ø)
ubuntu_clang_msan	73.41% <ø> (ø)
ubuntu_gcc	72.97% <ø> (ø)
ubuntu_gcc_aarch64	74.26% <ø> (ø)
ubuntu_gcc_aarch64_compat_no_opt	73.78% <ø> (ø)
ubuntu_gcc_aarch64_no_acle	74.07% <ø> (ø)
ubuntu_gcc_aarch64_no_neon	73.82% <ø> (ø)
ubuntu_gcc_armhf	72.20% <ø> (ø)
ubuntu_gcc_armhf_compat_no_opt	73.80% <ø> (ø)
ubuntu_gcc_armhf_no_acle	72.94% <ø> (ø)
ubuntu_gcc_armhf_no_neon	74.94% <ø> (ø)
ubuntu_gcc_armsf	72.17% <ø> (ø)
ubuntu_gcc_armsf_compat_no_opt	73.80% <ø> (ø)
ubuntu_gcc_compat_no_opt	74.88% <ø> (ø)
ubuntu_gcc_mingw_i686	0.00% <ø> (ø)
ubuntu_gcc_mingw_x86_64	0.00% <ø> (ø)
ubuntu_gcc_no_avx2	74.94% <ø> (ø)
ubuntu_gcc_no_pclmulqdq	71.41% <ø> (ø)
ubuntu_gcc_no_sse2	73.90% <ø> (ø)
ubuntu_gcc_no_sse4	71.37% <ø> (ø)
ubuntu_gcc_o3	72.85% <ø> (ø)
ubuntu_gcc_osb	75.83% <ø> (ø)
ubuntu_gcc_ppc	75.25% <ø> (ø)
ubuntu_gcc_ppc64	76.01% <ø> (ø)
ubuntu_gcc_ppc64le	74.77% <ø> (ø)
ubuntu_gcc_s390x	73.64% <ø> (ø)
ubuntu_gcc_sparc64	76.48% <ø> (ø)
win64_gcc	70.39% <ø> (ø)
win64_gcc_compat_no_opt	73.88% <ø> (ø)

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