Mark sigint_interrupt_enabled as sig_atomic_t

This is a continuation of 78fdb1e, where this flag is set in the psql
callback handler used for SIGINT.  This was previously a boolean but the
C standard recommends the use of sig_atomic_t.  Note that this
influences PromptInterruptContext in string.h, where the same flag is
tracked.

Author: Hayato Kuroda
Discussion: 
https://postgr.es/m/tyapr01mb58669a9ec96aa3078c2cd938f5...@tyapr01mb5866.jpnprd01.prod.outlook.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/5ac9e869191148741539e626b84ba7e77dc71670

Modified Files
--------------
src/bin/psql/common.c       | 2 +-
src/bin/psql/common.h       | 3 ++-
src/include/common/string.h | 4 +++-
3 files changed, 6 insertions(+), 3 deletions(-)

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