Bug 40: Change test on enable-thread-safety to not check against plat…

…forms.

As far as we can tell:

- All platforms we know of set this by default

- It's never safe not to require it, because we're not merely worried,
  when slon multithreads, about the Postgres bits, but also about
  attendant stuff like OpenSSL, where we can't control much about their
  thread safety.

config/acx_libpq.m4

@@ -167,27 +167,25 @@ if test -n "$PG_CONFIG_LOCATION"; then
        echo "pg_config says pg_sharedir is $PG_SHAREDIR"
     fi
 
+    AC_MSG_CHECKING(PostgreSQL for enable-thread-safety)
+    PG_ETS=`echo $PG_CONFIGURE | grep -c enable-thread-safety`
+    if test $PG_ETS -eq 0; then
+       AC_MSG_RESULT(no)
+       AC_MSG_ERROR(PostgreSQL needs to be compiled with --enable-thread-safety)
+    else
+       AC_MSG_RESULT(yes)
+    fi
+
     case ${host_os} in
-	aix*|*solaris*)
-		AC_MSG_CHECKING(PostgreSQL for enable-thread-safety as required on ${host_os})
-		PG_ETS=`echo $PG_CONFIGURE | grep -c enable-thread-safety`
-		if test $PG_ETS -eq 0; then
-			AC_MSG_RESULT(no)
-			AC_MSG_ERROR(PostgreSQL needs to be compiled with --enable-thread-safety on ${host_os})
-		else
-			AC_MSG_RESULT(yes)
-		fi
-	;;
         *mingw32*)
                 if test $PG_VERSION_MAJOR -ge 8 -a $PG_VERSION_MINOR -ge 2; then
                         AC_SUBST(NEED_PG_DLLINIT, 0)
                 else
                         AC_SUBST(NEED_PG_DLLINIT, 1)
                 fi
-        ;;
-	*)
-	;;
+        		;;
     esac
+
 	dnl ----
 	dnl Define the detected PostgreSQL version
 	dnl ----