tested on win32/64 to pass the tests when enabled
- libtcc.c :
let tcc define __leading_underscore if enabled
tcc_add_symbol() : add _ automatically
- tccelf.c : remove tcc_get_symbol_err(), find_c_sym()
currently symbol length is limited to 256 in several
places, so we can use a fixed local buffer for now as well.
- win32/lib/crtinit.c : new file for init/fini
- lib/*.S, tests7* : use __leading_underscore
- bt-log.c: this file wont work relibaly if compiled with gcc
This uses a glibc feature present since constructor/destructor support was added.
Modify tccrun.c to call constructor with argc, argcv, envp.
In lib/bcheck.c use these values to register them in the splay tree.
Remove HAS_ENVIRON is lib/bcheck.c as it is not needed any more.
Modify win32/lib/crt1.c/win32/lib/dllcrt1.c/win32/lib/wincrt1.c to also
call constructor with argc, argcv, envp.
While implementing I saw that tccrun did nog call main with envp. Fixed it.
Also fix fetch_and_add_arm.S to make it work on armv6 (raspberry pi default).
