As the former only contains a single procedure, move it into `psobjs' for
simplicity. Also change the parameter order to the conventional one.
* src/psaux/psdecode.c (ps_decoder_init): Moved to...
* src/psaux/psobjs.c: ...Here.
* src/psaux/psdecode.h, src/psaux/psobjs.h: Ditto.
* include/freetype/internal/psaux.h: Update function signature.
* src/cff/cffgload.c, src/cid/cidgload.c, src/type1/t1gload.c: Update calls.
* src/psaux/psaux.c, src/psaux/psauxmod.c: Update includes.
* src/psaux/Jamfile, src/psaux/rules.mk: Update file references.
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