fix invalid getc -> putc hook
hook __isthreaded to make some hooks effective (see the comment in
libc_mapping.h for further information)
add missing feof hook
wrap getaddrinfo and freeaddrinfo because of bionic/libc struct addrinfo
missmatch (dirty fix)
hook __errno (in bionic errno is replaced by *(__errno()))
wrap sysconf because of define mismatches
hook gethostbyname
Merge remote-tracking branch 'liar/various'

Conflicts:
	compat/libc_mapping.h