Add #error to modules and files that do not support PIC yet.

When FT_CONFIG_OPTION_PIC is defined the following files will
create #error:
* src/bdf/bdfdrivr.h
* src/cache/ftcmanag.c
* src/cid/cidriver.h
* src/gxvalid/gxvmod.h
* src/gzip/ftgzip.c
* src/lzw/ftlzw.c
* src/otvalid/otvmod.h
* src/pcf/pcfdrivr.h
* src/pfr/pfrdrivr.h
* src/psaux/psauxmod.h
* src/type1/t1driver.h
* src/type42/t42drivr.h
* src/winfonts/winfnt.h
14 files changed