Remember current porting state

 - ssl_engine_pphrase.c .... pass-phrase handling

 - ssl_engine_rand.c ....... PRNG support

 - ssl_engine_vars.c ....... Variable Expansion support

 - ssl_expr.c .............. expression handling main source

 - ssl_expr.h .............. expression handling common header

 # ssl_expr.c .............. expression handling main source

 # ssl_expr.h .............. expression handling common header

 - ssl_expr_scan.c ......... expression scanner automaton (pre-generated)

 - ssl_expr_scan.l ......... expression scanner source

 - ssl_expr_parse.c ........ expression parser automaton  (pre-generated)

 - ssl_expr_parse.h ........ expression parser header     (pre-generated)

 - ssl_expr_parse.y ........ expression parser source

 - ssl_expr_eval.c ......... expression machine evaluation

 # ssl_expr_eval.c ......... expression machine evaluation

 - ssl_scache.c ............ session cache abstraction layer

 - ssl_scache_dbm.c ........ session cache via DBM file

 - ssl_scache_shmcb.c ...... session cache via shared memory cyclic buffer