pgsql: Use return instead of exit() in configure

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 <hlinnaka@iki.fi>
Reviewed-by: Thomas Munro <thomas.munro@enterprisedb.com>

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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