[pk] Resolve failing of `PK_CMap'.

* src/pk/pkdrivr.c(pk_cmap_char_{index, next}): Use `linear search'
instead of `binary search' in the encoding table as it will always
be unsorted.

* src/pk/pklib.c: Resolve issues occurred in the previous commit
which caused errors in glyph loading on `ft2-demos'.
2 files changed