Fix -l${MATH_LIB} bug introduced by recent change of MATH_LIB from "m" to the full pathname of the math library.
Fix -l${MATH_LIB} bug introduced by recent change of MATH_LIB from "m" to the
full pathname of the math library.

svn path=/trunk/; revision=8310

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