Use return instead of exit() in configure

Using exit() requires stdlib.h, which is not included.  Use return
instead.  Also add return type for main().

Reviewed-by: Heikki Linnakangas <[email protected]>
Reviewed-by: Thomas Munro <[email protected]>

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/1c0cf52b39ca3a9a79661129cff918dc000a55eb

Modified Files
--------------
config/c-compiler.m4 |  4 +++-
config/c-library.m4  |  4 +++-
configure            | 12 +++++++++---
3 files changed, 15 insertions(+), 5 deletions(-)


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