math/libsemigroups: Fix PLIST

• Bump PORTREVISION for package change

> Checking for pkg-plist issues (check-plist)

> Parsing plist

> Checking for items in STAGEDIR missing from pkg-plist

Error: Orphaned: include/libsemigroups/HPCombi/include/bmat8.hpp
Error: Orphaned: include/libsemigroups/HPCombi/include/bmat8_impl.hpp
Error: Orphaned: include/libsemigroups/HPCombi/include/epu.hpp
Error: Orphaned: include/libsemigroups/HPCombi/include/epu_impl.hpp
Error: Orphaned: include/libsemigroups/HPCombi/include/fallback/gcdlcm.hpp
Error: Orphaned: include/libsemigroups/HPCombi/include/fallback/seq.hpp
Error: Orphaned: include/libsemigroups/HPCombi/include/hpcombi.hpp
Error: Orphaned: include/libsemigroups/HPCombi/include/perm16.hpp
Error: Orphaned: include/libsemigroups/HPCombi/include/perm16_impl.hpp
Error: Orphaned: include/libsemigroups/HPCombi/include/perm_generic.hpp
Error: Orphaned: include/libsemigroups/HPCombi/include/perm_generic_impl.hpp
Error: Orphaned: include/libsemigroups/HPCombi/include/power.hpp
Error: Orphaned: include/libsemigroups/HPCombi/include/testtools.hpp
Error: Orphaned: include/libsemigroups/HPCombi/include/vect16.hpp
Error: Orphaned: include/libsemigroups/HPCombi/include/vect_generic.hpp

> Checking for items in pkg-plist which are not in STAGEDIR

> Error: Plist issues found.

• Error code 1

Approved by: portmgr (blanket)