#5 Enable gdbserver

[Christoph Schwarz]

gdbserver integration is still incomplete. This task is to enable full gdbserver support. This includes (but might not be limited to) the following tasks:

• enable vgdb in coregrind/Makefile.am
• port coregrind/vgdb.c
• port VG_(start_debugger) in coregrind/m_debugger.c
• enable gdbserver related code in coregrind/m_translate.c
• enable as many test programs as possible in gdbserver_tests/Makefile.am