[AC21.5] Improve Installation text for Postgresql

APPROVE COMMIT 21.5

Just a tiny nit.  Our use of Postgresql bindings hasn't changed since
V7, but they still seem to work AFAICT (I only connect to the
postgresql server to check, they definitely compile).  Reference to
Postgresql "V7" seemed a little confusing to me until I realized that
we were checking for an API that became available in V7.

diff -r 69f9e31c9ccf -r 83e5c3cd6be6 ChangeLog
--- a/ChangeLog	Sat Jan 10 17:11:19 2015 +0900
+++ b/ChangeLog	Sat Jan 10 19:43:28 2015 +0900
@@ -1,3 +1,8 @@
+2015-01-10  Stephen J. Turnbull  <[email protected]>
+
+	* configure.ac (Postgresql): Improve Installation text.
+	* configure: Rebuild.
+
 2015-01-08  Stephen J. Turnbull  <[email protected]>
 
 	Fix progress bar crashes.
diff -r 69f9e31c9ccf -r 83e5c3cd6be6 configure
--- a/configure	Sat Jan 10 17:11:19 2015 +0900
+++ b/configure	Sat Jan 10 19:43:28 2015 +0900
@@ -22203,7 +22203,7 @@
 if test "$with_postgresql" = yes; then
   echo "  Compiling in support for PostgreSQL."
   echo "    - Using PostgreSQL header file:  $libpq_fe_h_file"
-  test "$with_postgresqlv7" = yes && echo "    - Using PostgreSQL V7 bindings."
+  test "$with_postgresqlv7" = yes && echo "    - Using PostgreSQL V7+ bindings."
 fi
 
 echo "
diff -r 69f9e31c9ccf -r 83e5c3cd6be6 configure.ac
--- a/configure.ac	Sat Jan 10 17:11:19 2015 +0900
+++ b/configure.ac	Sat Jan 10 19:43:28 2015 +0900
@@ -6039,7 +6039,7 @@
 if test "$with_postgresql" = yes; then
   echo "  Compiling in support for PostgreSQL."
   echo "    - Using PostgreSQL header file:  $libpq_fe_h_file"
-  test "$with_postgresqlv7" = yes && echo "    - Using PostgreSQL V7 bindings."
+  test "$with_postgresqlv7" = yes && echo "    - Using PostgreSQL V7+ bindings."
 fi
 
 echo "