fixes bug 901177 - build system changes for json stackwalker
Fixes bug 926078 - updates stackwalker

This reverts commit 2d0486fbcf317f3bb90e2828136befa3a95288e0.
Merge pull request #1596 from rhelmer/bug928145-reland-JSON-stackwalker-changes

Bug928145 reland json stackwalker changes