Since glibc-2.43:

For ISO C23, the functions bsearch, memchr, strchr, strpbrk, strrchr,
strstr, wcschr, wcspbrk, wcsrchr, wcsstr and wmemchr that return pointers
into their input arrays now have definitions as macros that return a
pointer to a const-qualified type when the input argument is a pointer
to a const-qualified type.

Signed-off-by: purofle <yuguo.or@isrc.iscas.ac.cn>

Includes ${EXTIP4} and ${EXTIP6} for signing server's external IPs.

${DANE0} and ${DANE1} interpret the dane definition that's ongoing and look
for the matching tls certificate to produce the hash

These are from 16 old Coverity hits that I dismissed in my Coverity UI...
of course any other coverity user testing it doesn't get to know my
assessment.

So these are an attempt to silence these false positives by either
commenting the code as OK for Coverity to read, or modifying it to avoid
whatever it thought was happening the other way.

This simpifies enabling build of the -camshow example by LWS_WITH_WEBRTC