[Bug 271316] textproc/augeas: fix build with clang 16

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=271316

            Bug ID: 271316
           Summary: textproc/augeas: fix build with clang 16
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: puppet@FreeBSD.org
          Reporter: dim@FreeBSD.org
          Assignee: puppet@FreeBSD.org
             Flags: maintainer-feedback?(puppet@FreeBSD.org)

Clang 16 has a new error about incompatible integer to pointer
conversions, which shows up when building textproc/augeas:

  augprint.c:1477:24: warning: call to undeclared function 'basename'; ISO C99
and later do not support implicit function declarations
[-Wimplicit-function-declaration]
    char *program_name = basename(argv[0]);
                         ^
  augprint.c:1477:9: error: incompatible integer to pointer conversion
initializing 'char *' with an expression of type 'int' [-Wint-conversion]
    char *program_name = basename(argv[0]);
          ^              ~~~~~~~~~~~~~~~~~

This is because basename(3) is declared in <libgen.h>, but augprint.c
does not include it. Add the include to fix the error.

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