pgsql: psql: fix startup crash caused by PSQLRC containing a tilde

psql: fix startup crash caused by PSQLRC containing a tilde

'strdup' the PSQLRC environment variable value before calling a routine
that might free() it.

Backpatch to 9.2, where the bug first appeared.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/48a2cd370e2610f0a196240aed9f5abd82d3dada

Modified Files
--------------
src/bin/psql/common.c | 6 +++---
src/bin/psql/common.h | 2 +-
src/bin/psql/startup.c | 11 ++++++-----
3 files changed, 10 insertions(+), 9 deletions(-)

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