Add back in find_my_exec() support on platforms that include pgport.
find_my_exec, a postgresql pgport function is again used to find the
location of the slonik binary to locate the share directory.
This is for installs where the install location is not known at
compile time.

Some distributions don't include pgport, this is disabled by default
if you compile with pgport support set to yes (a configure option/check)
then this will be enabled.

Patch submitted by Sandeep Thakkar <sandeep.thakkar at enterprisedb.com>

Branch
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REL_2_1_STABLE

Details
-------
http://git.postgresql.org/gitweb?p=slony1-engine.git;a=commitdiff;h=b034434e6279da67008402575ed768a666b827a9

Modified Files
--------------
Makefile.global.in   |    3 +++
config.h.in          |    4 ++++
config/acx_libpq.m4  |    7 +++++++
configure.ac         |    4 +++-
src/slonik/Makefile  |    2 ++
src/slonik/slonik.c  |   19 +++++++++++++++++++
src/slonik/win32.mak |    6 +++---
7 files changed, 41 insertions(+), 4 deletions(-)