Catch fatal flex errors in the GUC file lexer.

This prevents the postmaster from unexpectedly croaking if postgresql.conf
contains something like:

include 'invalid_directory_name'

Noah Misch. Reviewed by Tom Lane and myself.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/4b496a3583ecb3f70bb4d13f8275dbb7e5b26100

Modified Files
--------------
src/backend/utils/misc/guc-file.l |   65 ++++++++++++++++++++++++++++++-------
1 files changed, 53 insertions(+), 12 deletions(-)

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