Strengthen against resource leaks upon exceptions.

* glob.c (glob_wrap): Perform argument conversions
that might throw before allocating UTF-8 string.

* parser.y (text): In the action for SPACE, the lexeme
is not needed so free($1) right away. If regex_compile
were to throw an exception, that lexeme will leak.

* socket.c (getaddrinfo_wrap): Harden against leakage of
node_u8 and service_u8 strings with an unwind block.
For instance, the hints structure could contain
bad values which cause addrinfo_in to throw.

* stream.c (make_string_byte_input_stream): Perform
possibly throwing argument conversions before allocating
resources.

* sysif.c (mkdir_wrap, mknod_wrap, chmod_wrap, symlink_wrap,
link_wrap, setenv_wrap, crypt_wrap): Likewise.

* syslog.c (openlog_wrap, syslog_wrapv): Likewise.

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