Add a relative path to the "#line" directives we produce. Regenerate the

Add a relative path to the "#line" directives we produce. Regenerate the
SNMP and SPNEGO dissectors to see if it helps Coverity locate the
original source files.

git-svn-id: http://anonsvn.wireshark.org/wireshark/trunk@36522 f5534014-38df-0310-8fa8-9805f1628bb7