libdeng1: Prefix PI, PI_D macros with 'DD_'
Also removed the "undef PI" from libdeng2's math.h as this is notdefined on platform we currently target (AFAIK, its M_PI).
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libdeng1: Prefix PI, PI_D macros with 'DD_'
Also removed the "undef PI" from libdeng2's math.h as this is not
defined on platform we currently target (AFAIK, its M_PI).