[Bug 271486] audio/espeak-ng: fix build with clang 16

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=271486

            Bug ID: 271486
           Summary: audio/espeak-ng: 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: se@FreeBSD.org
          Reporter: dim@FreeBSD.org
             Flags: maintainer-feedback?(se@FreeBSD.org)
          Assignee: se@FreeBSD.org

Since clang 16 (and gcc 11) the default C++ standard is now gnu++17.
Because audio/espeak-ng's Makefile does not explicitly set its C++
standard, this leads to an error:

  src/speechPlayer/src/speechWaveGenerator.cpp:197:56: error: reference to
'sample' is ambiguous
          unsigned int generate(const unsigned int sampleCount, sample*
sampleBuf) {
                                                                ^
  src/speechPlayer/src/sample.h:23:3: note: candidate found by name lookup is
'sample'
  } sample;
    ^
  /usr/include/c++/v1/__algorithm/sample.h:95:17: note: candidate found by name
lookup is 'std::sample'
  _SampleIterator sample(_PopulationIterator __first,
                  ^

This is because speechWaveGenerator.cpp has "using namespace std;" at
the top, so "sample" can match both "std::sample" (from <algorithm>) and
"struct sample" (from sample.h). Qualify "sample" as "::sample" to work
around the problem.

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