[Bug 281141] editors/le: fix build with recent libc++ headers

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=281141

            Bug ID: 281141
           Summary: editors/le: fix build with recent libc++ headers
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: zi@FreeBSD.org
          Reporter: dim@FreeBSD.org
             Flags: maintainer-feedback?(zi@FreeBSD.org)
          Assignee: zi@FreeBSD.org

As reported on the ports mailing lists, with recent libc++ headers on e.g.
15.0-CURRENT, 13.4 or 14.2, editors/le fails with errors similar to:

/usr/include/c++/v1/ios:257:25: error: expected ')'
  257 |   static const fmtflags hex         = 0x0008;
      |                         ^
./edit.h:158:26: note: expanded from macro 'hex'
  158 | #define hex     (editmode==HEXM)
      |                          ^
/usr/include/c++/v1/ios:257:25: note: to match this '('
./edit.h:158:17: note: expanded from macro 'hex'
  158 | #define hex     (editmode==HEXM)
      |                 ^

This is because edit.h defines a `hex` macro, and this clashes with std::hex
from the libc++ headers.

I am attaching a diff which uses post-patch to rename the `hex` macro to
`is_hex`.

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