Does not build in OS X

[namotco]

OS X 10.4.10 (Intel) fails to build:

/bin/sh ../libtool --tag=CC --mode=compile gcc -DHAVE_CONFIG_H -I. -I.. -g -O2 -funsigned-char -MT mod_iq_time.lo -MD -MP -MF .deps/mod_iq_time.Tpo -c -o mod_iq_time.lo mod_iq_time.c

gcc -DHAVE_CONFIG_H -I. -I.. -g -O2 -funsigned-char -MT mod_iq_time.lo -MD -MP -MF .deps/mod_iq_time.Tpo -c mod_iq_time.c -fno-common -DPIC -o .libs/mod_iq_time.o

mod_iq_time.c: In function '_iq_time_pkt_sm': mod_iq_time.c:81: error: wrong type argument to unary minus mod_iq_time.c:81: error: wrong type argument to unary minus make[2]: *** [mod_iq_time.lo] Error 1 make[1]: *** [all-recursive] Error 1 make: *** [all] Error 2

[smoku]

(In [426]) Changed timezone typecasting. Fixes #158