cmake HAVE_RAND48 examples

JulNadeauCA/libagar CMakeChecks.cmake :2474

check_c_source_compiles("
#include <stdlib.h>

int
main(int argc, char *argv[])
{
	double d1, d2;
	unsigned short xbuf[3] = { 1,2,3 };
	unsigned short p[7];
	long l1, l2;
	d1 = drand48(); d2 = erand48(xbuf);
	l1 = lrand48(); l2 = nrand48(xbuf);
	srand48(l1);
	lcong48(p);
	return (0);
}
" HAVE_RAND48)