Build vgdb and lackey tools

vgdb allows debugging apps from perspective of valgrind's emulated CPU.
lackey tool allows to observe execution traces and memory access traces.

Test: lackey tool worked out of the box.
vgdb functionality that was tested:
- attaching to a valgrind process launched with --vgdb=yes
- frame disassembly with sources
- settings breakpoints / continuing / breaking into those breakpoints

Change-Id: I4d9cb2e9caaad18ad0e6dcbdf32de53c9278f5eb
1 file changed