Revert "fixes bug 901177 - build system changes for json stackwalker"

This reverts commit ba51b1bd8d4598e9d9d347558502b73bc122b262.
Revert "fixes bug 901177 - no need to rename breakpad to stackwalk anymore"

This reverts commit 96e28fb99740a711c373b3e6aeee7f9a8a39eb31.
Revert "enhancements to jDump processing - better sentinel detection"

This reverts commit f37fe1c8d61842b020cdd5928598b386489c6fbb.
Revert "Fixes bug 926078 - updates stackwalker"

This reverts commit e397c9afed19afc7b5a252457ad16315f4b83986.
Revert "added support for jDump from jMDSW"

This reverts commit f0207c82f0310b37289a0b0e4a98c4171b44e138.
Merge pull request #1591 from rhelmer/bug927454-back-out-JSON-stackwalker-changes

Bug927454 back out json stackwalker changes