Get the absolute OS path

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getOsPath.p returns a fully qualified path including a trailing slash or backslash, depending on the operating system. It can return UNC¹ paths, but don't use UNC paths in Windows® .cmd/.bat files or with Windows® command line utilities, because those won't handle them properly.
Usage:

def var cWhat as char no-undo.
def var cPath as char no-undo.
run getOsPath.p(
        input cWhat,    /*
WorkDir         : Progress current directory
TempDir         : OS tempDir
AppTempDir     : Progress tempDir
A relative path : relative path like "tools" "tools/temp" or "./tools"
                        */
        output cPath). /* ? on failure || OS-Path incl. trailing slash */

RUN getOsPath.p(input 'TempDir':U, output cPath). /* returns the tmpDir */

RUN getOsPath.p(input 'WorkDir':U, output cPath). /* returns the working directory of the current session */

RUN getOsPath.p(input 'tools/filesystem':U, output cPath). /* returns a fully qualified path like //server/.../progress/wrk/tools/filesystem/ */