Backport of tooling support for including the debug build in the VSIX package.
Correct the design-time library file path in the VSIX package now that it is per-configuration.
Add QNX-specific performance tweaks to the unix VFS. (Cherry-pick merge of
[b02849e7bde458].)
Put auxiliary libraries after libsqlite3.a in the testfixture target of
the "main.mk" makefile.  (Cherry-pick merge of [8fc8548f52ab8fcfb5].)
Backport the [/timeline?r=shared-cache-fix | shared-cache-fix] branch.
Backport VSIX tooling and packaging fixes and enhancements.
Avoid an assertion fault and/or freeing memory while it is still in use when
an error occurs during virtual table construction. Cherrypick of [a02599ad85d].