apply -Wno-error for GCC 12.

this code seems broken. hash_table_del() is called on a ptr that was
either just freed (realloc() case) or will be freed (xfree_impl() case),
but in both cases hash_tab

apply -Wno-error for GCC 12.

this code seems broken. hash_table_del() is called on a ptr that was
either just freed (realloc() case) or will be freed (xfree_impl() case),
but in both cases hash_table_del() will free() the same address. for
the realloc() case, as it's after free(), it's UB. for the xfree_impl()
case, it can be solved by not free()ing here.

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Revert CC_WNO_USE_AFTER_FREE from Makefile's (thanks uwe@)

Sprinkle CC_WNO_USE_AFTER_FREE for GCC 12

All of them are blamed for idiom equivalent to:
newbuf = realloc(buf, size);
p = newbuf + (p - buf);

Bump WARNS to 5 (via ../Makefile.inc).
Remove unnecessary -Wno-stack-protector flag.

Fix build with stack smash protection enabled.

make this work:
- split alloca stuff in a separate file
- fix size_t/int/long inconsistencies
- fix weak alias stuff
- make paths consistent
- fix config files
- use switch instead of if/then/elseif.

make this work:
- split alloca stuff in a separate file
- fix size_t/int/long inconsistencies
- fix weak alias stuff
- make paths consistent
- fix config files
- use switch instead of if/then/elseif...
- fix Makefiles

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