Add the callback and some conditionals to switch between the two
engines.
* include/freetype/internal/psaux.h (T1_Decoder_FuncsRec): Change
function declarations.
* src/psaux/psauxmod.c: Register the callbacks.
* src/psaux/psobjs.c: Add conditionals for number conversion.
* src/type1/t1gload.c: Add code to choose which renderer to use.
* src/cid/cidgload.c: Update call.
* src/base/ftobjs.c, src/psaux/psobjs.c, src/type1/t1gload.c: Update
includes.
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