optionVersion - return the compiled AutoOpts version number

       Returns the full version string compiled into the library.  The returned string cannot be modified.

       optionVersion - return the compiled AutoOpts version number

       the version string in constant memory

       The info documentation for the -lopts library.
       ao_string_tokenize(3),  configFileLoad(3), optionFileLoad(3), optionFindNextValue(3), optionFindValue(3),
       optionFree(3),    optionGetValue(3),    optionLoadLine(3),    optionMemberList(3),    optionNextValue(3),
       optionOnlyUsage(3),      optionPrintVersion(3),     optionPrintVersionAndReturn(3),     optionProcess(3),
       optionRestore(3),    optionSaveFile(3),    optionSaveState(3),    optionUnloadNested(3),    strequate(3),
       streqvcmp(3), streqvmap(3), strneqvcmp(3), strtransform(3),

                                                   2018-08-26                                   optionVersion(3)

       #include <your-opts.h>
       cc [...] -o outfile infile.c -lopts [...]

       char const * optionVersion(void);