[QNET6] Try to fix solaris buildboot.

[QNET6] Try to fix solaris buildboot.
/Users/buildslave/Documents/wireshark/osx105x86/build/epan/dissectors/packet-qnet6.c:1502: warning: 'hf_index' may be used uninitialized in this function
/Users/buildslave/Documents/wireshark/osx105x86/build/epan/dissectors/packet-qnet6.c:1502: note: 'hf_index' was declared here
/Users/buildslave/Documents/wireshark/osx105x86/build/epan/dissectors/packet-qnet6.c:1502: warning: 'hf_index_off' may be used uninitialized in this function
/Users/buildslave/Documents/wireshark/osx105x86/build/epan/dissectors/packet-qnet6.c:1502: note: 'hf_index_off' was declared here
/Users/buildslave/Documents/wireshark/osx105x86/build/epan/dissectors/packet-qnet6.c:1500: warning: 'sstree' may be used uninitialized in this function
/Users/buildslave/Documents/wireshark/osx105x86/build/epan/dissectors/packet-qnet6.c:1500: note: 'sstree' was declared here
/Users/buildslave/Documents/wireshark/osx105x86/build/epan/dissectors/packet-qnet6.c:1502: warning: 'hf_index_len' may be used uninitialized in this function
/Users/buildslave/Documents/wireshark/osx105x86/build/epan/dissectors/packet-qnet6.c:1502: note: 'hf_index_len' was declared here

Remove not needed includes.

Change-Id: Iac91954b3d6c8f9799c6fe816af93376419d1b21
Reviewed-on: https://code.wireshark.org/review/6945
Reviewed-by: Anders Broman <a.broman58@gmail.com>