fix warning about overflow if matiec is running on 64-bit platform,
but the generated C code will cross-compiled for 32-bit platform

For example:
./build/config.c:29:39: error: large integer implicitly truncated to unsigned type [-Werror=overflow]
unsigned long greatest_tick_count__ = 18446744073709551611UL; /*tick*/
^
compilation terminated due to -Wfatal-errors.
cc1: all warnings being treated as errors

include ../../common.mk

lib_LIBRARIES = libstage4_c.a

libstage4_c_a_SOURCES = generate_c.cc 

libstage4_c_a_LIBADD = ../stage4.o

libstage4_c_a_CPPFLAGS = -I../../../absyntax