[core] ck_calloc() ck_malloc() ck_realloc_u32()

checking functions to wrap calloc(), malloc(), and realloc(),
which ck_assert() that memory allocation succeeds

ck_realloc_u32() additionally checks

[core] ck_calloc() ck_malloc() ck_realloc_u32()

checking functions to wrap calloc(), malloc(), and realloc(),
which ck_assert() that memory allocation succeeds

ck_realloc_u32() additionally checks for integer overflow in args
and that nmemb fits in uint32_t

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[core] errno_t and rsize_t detection on Illumos

(thx devnexen)

[core] errno_t detection on Illumos

(thx devnexen)

[core] earlier macOS need define for errno_t (fixes #3107)

Earlier macOS need _DARWIN_C_SOURCE defined for errno_t from sys/types.h

Alternatively, define __STDC_WANT_LIB_EXT1__ >= 1 before include

[core] earlier macOS need define for errno_t (fixes #3107)

Earlier macOS need _DARWIN_C_SOURCE defined for errno_t from sys/types.h

Alternatively, define __STDC_WANT_LIB_EXT1__ >= 1 before include errno.h

x-ref:
"error: unknown type name 'errno_t' (macOS 10.13.6)"
https://redmine.lighttpd.net/issues/3107

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[multiple] __attribute_nonnull__ now takes params

define __attribute_nonnull__(params) with params to match
recent changes in glibc development (targetting glibc 2.35 in Feb 2022)

x-ref:
new __at

[multiple] __attribute_nonnull__ now takes params

define __attribute_nonnull__(params) with params to match
recent changes in glibc development (targetting glibc 2.35 in Feb 2022)

x-ref:
new __attribute_nonnull__(params) conflicts with third-party
https://sourceware.org/bugzilla/show_bug.cgi?id=28425

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[build] define rsize_t on FreeBSD

(unsure why lighttpd CI CMake build has rsize_t defined,
but not autotools or SCons lighttpd CI builds)

[core] expose ck_bt() for debugging

[core] move backtrace and assert macros to ck.[ch]

[multiple] move const time cmp funcs to ck.[ch]

http_auth_const_time_memeq_pad() -> ck_memeq_const_time()
http_auth_const_time_memeq() -> ck_memeq_const_time_fixed_len()

[core] ck.[ch] - C11 Annex K wrappers

(selected functions; not complete)

(import from one of my development branches from 2016)

define safe_memclear() -> ck_memzero() for transition