Add a prediff file to squash C error message line numbers.
Update the sed script to filter out line numbers too (for newer GCC versions).
Merge pull request #406 from hildeth/squashCLineNumbers

Add a prediff file to squash C error message line numbers...

... and column numbers, too, for more modern versions of GCC.

The test is classes/bradc/arrayInClass/genericArrayInClass-otharrs-inline-iterators.chpl.