Makefile generator: escape single quotes when storing command lines.
Makefile generator: escape single quotes when storing command lines.

This fixes a problem where we lose quotes in processing command lines,
which meant that if your $CC had single quotes in it, it would always
rebuild.

Review URL: http://codereview.chromium.org/159741

git-svn-id: e7e1075985beda50ea81ac4472467b4f6e91fc78@572 78cadc50-ecff-11dd-a971-7dbc132099af

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