devel/cmake-core devel/cmake-gui misc/mbuffer: cope with librhash.so bump

Because rhash 1.4.4 updated the librhash.so symlink from .0 to .1,
build-time dependents such as cmake-core and cmake-gui need their
PORTREVISION bumped.

The other case is misc/mbuffer, which uses librhash only at runtime, but
hardcodes dlopen("librhash.so.0", RTLD_NOW). I changed this to just
"librhash.so", and it seems to work fine with light testing.

PR: 273775
Reported by: Tomoaki AOKI <junchoon@dec.sakura.ne.jp>
Fixes: e0acbd158ec9 security/rhash: update to 1.4.4 and fix build with lld 17
MFH: 2023Q3