fix a syntactical error in thc_open_ipv6
fix a syntactical error in thc_open_ipv6

There was an error in compilation
make
gcc -O2 -D_HAVE_SSL   -c -o thc-ipv6-lib.o thc-ipv6-lib.c
thc-ipv6-lib.c: In function ‘thc_open_ipv6’:
thc-ipv6-lib.c:2403:5: error: expected ‘)’ before ‘thc_ipv6_rawmode’
     thc_ipv6_rawmode(1);
     ^
thc-ipv6-lib.c:2573:1: error: expected expression before ‘}’ token
 }
 ^
make: *** [thc-ipv6-lib.o] Error 1

vanhauser-thc/thc-ipv6,vanhauser-thc/thc-ipv6,vanhauser-thc/thc-ipv6