Update to the latest libcharset commit.

Most of the changes since Halibut's last update have been to
libcharset's supporting utility collection or have added extra API
functions that Halibut doesn't need, but one actually relevant thing
that this change brings in is the expanded set of easy-to-type
character set encoding names, so that for example you can now say
-Ctext-charset:mac-roman where you would previously have had to put a
space in the middle of 'Mac Roman' and faff about with quoting on the
shell command line.

1 files changed, 0 insertions, 0 deletions

diff --git a/charset b/charset
-Subproject 89123b0bdbb3b2780a1bc16d95813f08f43801e
+Subproject a7353cf60d896b33f103a26bc73cce535990d5c