Use char* instead of caddr_t

[mtl1979]

See #621. Type caddr_t was removed in recent version of sys/types.h

[codecov]

Codecov Report

Merging #622 into develop will decrease coverage by 3.46%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop     #622      +/-   ##
===========================================
- Coverage    78.42%   74.96%   -3.47%     
===========================================
  Files           55       55              
  Lines         7133     7057      -76     
  Branches      1212     1199      -13     
===========================================
- Hits          5594     5290     -304     
- Misses        1046     1277     +231     
+ Partials       493      490       -3     

Flag	Coverage Δ
#macos_clang	?
#macos_gcc	67.19% <ø> (ø)
#ubuntu_clang	72.04% <ø> (ø)
#ubuntu_clang_debug	71.61% <ø> (ø)
#ubuntu_clang_inflate_allow_invalid_dist	71.75% <ø> (ø)
#ubuntu_clang_inflate_strict	72.04% <ø> (ø)
#ubuntu_clang_msan	71.81% <ø> (ø)
#ubuntu_gcc	74.86% <ø> (-0.39%)	⬇️
#ubuntu_gcc_aarch64_compat	?
#ubuntu_gcc_aarch64_compat_no_opt	?
#ubuntu_gcc_armhf	73.14% <ø> (ø)
#ubuntu_gcc_armhf_compat	73.20% <ø> (-0.26%)	⬇️
#ubuntu_gcc_armhf_compat_no_neon	72.78% <ø> (ø)
#ubuntu_gcc_armhf_compat_no_opt	?
#ubuntu_gcc_armhf_no_neon	?
#ubuntu_gcc_armhf_no_opt	72.37% <ø> (ø)
#ubuntu_gcc_armsf	?
#ubuntu_gcc_armsf_compat	73.46% <ø> (ø)
#ubuntu_gcc_armsf_compat_no_opt	72.68% <ø> (ø)
#ubuntu_gcc_armsf_no_acle	?
#ubuntu_gcc_armsf_no_opt	?
#ubuntu_gcc_compat_no_opt	72.71% <ø> (ø)
#ubuntu_gcc_compat_sani	72.05% <ø> (ø)
#ubuntu_gcc_no_avx2	72.68% <ø> (ø)
#ubuntu_gcc_no_opt	72.40% <ø> (ø)
#ubuntu_gcc_no_pclmulqdq	70.94% <ø> (ø)
#ubuntu_gcc_no_sse2	?
#ubuntu_gcc_no_sse4	?
#ubuntu_gcc_osb	?
#ubuntu_gcc_ppc64_compat	73.11% <ø> (ø)
#ubuntu_gcc_ppc64le_compat	73.10% <ø> (ø)
#ubuntu_gcc_ppc_compat	?
#ubuntu_gcc_s390x_compat	?
#ubuntu_gcc_sparc64_compat	?
#win64_gcc	?
#win64_gcc_compat	?
#win64_gcc_compat_no_opt	?

Impacted Files	Coverage Δ
test/minigzip.c	58.39% <ø> (-0.18%)	⬇️
trees.c	5.75% <0.00%> (-65.80%)	⬇️
zutil.c	0.00% <0.00%> (-40.00%)	⬇️
deflate.h	0.00% <0.00%> (-30.00%)	⬇️
memcopy.h	87.11% <0.00%> (-4.83%)	⬇️
test/fuzz/minigzip_fuzzer.c	54.78% <0.00%> (-2.98%)	⬇️
test/switchlevels.c	53.93% <0.00%> (-2.12%)	⬇️
inftrees.c	94.91% <0.00%> (-1.70%)	⬇️
deflate.c	67.09% <0.00%> (-0.12%)	⬇️
... and 4 more

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