Added separate variables for jpeg, png & zlib CFLAGS & LIBS.
Added --with-option=dir support for jpeg, png & zlib.
Split X defines into XCFLAGS, XLDFLAGS & XLIBS.
Will attempt to link nspr against the proper thread lib if the initial check fails.
Removed last vestiges of NO_SECURITY.
Modified cmd/{gnome,qt,x}fe/Makefile to only use autoconf defined variable for the final link.
Changed ACCFLAGS to OS_CFLAGS. Changed ACLIBS to OS_LIBS.
OPTIMIZER (config.mk) is no longer set for autoconf.
No longer includes platform specific .mk