Bootrom Tools: Build tools: Improve makedrop error handling
Bootrom Tools: Build tools: Improve makedrop error handling

Modified makedrop to exit on the first build error, naming the build
configuration in the error message. (Previously it blindly processed a list
of bootrom build configurations)

Testing Done: verified that it halts on a build error and identifies the configuratinl
Bug Number: SW-1205
Review URL: https://reviews.leaflabs.com/r/1786/
Reviewed by:

Signed-off-by:  Morgan Girling <980e61e2e2b82c453db57c2e8646c01fbd3318cd@bsquare.com>

gregkh/bootrom-tools,gregkh/bootrom-tools,gregkh/bootrom-tools,projectara/bootrom-tools,projectara/bootrom-tools,projectara/bootrom-tools