Changed "static void plhrsh" to "void plhrsh" in src/plsym.c
Changed "static void plhrsh" to "void plhrsh" in src/plsym.c

- At this time, src/plmetafile.c needs plhrsh to render symbols

Signed-off-by: Phil Rosenberg <9901a440f3cf66948c4597f96eeea872ee8b06a8@gmail.com>

FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot