Add warning when compiling with iODBC support

When running configure, libiodbc2 development headers will fulfill the
requirement for ODBC development headers, but will not function
properly. This adds a warning when libiodbc2 development headers are
detected instead of unixodbc development headers.

(closes issue ASTERISK-22459)
Reported by: Patrick Maille
Tested by: Walter Doekes
Patches:
    issueA22459_warn_when_using_iodbc.patch uploaded by Walter Doekes (License 5674)
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Merged revisions 400767 from http://svn.asterisk.org/svn/asterisk/branches/1.8
........

Merged revisions 400768 from http://svn.asterisk.org/svn/asterisk/branches/11


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/12@400769 65c4cc65-6c06-0410-ace0-fbb531ad65f3

configure

@@ -1,5 +1,5 @@
 #! /bin/sh
-# From configure.ac Revision: 400178 .
+# From configure.ac Revision: 400384 .
 # Guess values for system-dependent variables and create Makefiles.
 # Generated by GNU Autoconf 2.69 for asterisk trunk.
 #
@@ -32871,6 +32871,15 @@ echo "       \$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$.                "
 echo
 fi
 
+if test "x${AST_IODBC_FOUND}" = "xyes"; then
+	echo "WARNING: iodbc libs/headers found!"
+	echo
+	echo "  If you plan to use ODBC functionality, you should consider"
+	echo "  switching to unixodbc instead."
+	echo "  See: https://issues.asterisk.org/jira/browse/ASTERISK-22459"
+	echo
+fi
+
 { $as_echo "$as_me:${as_lineno-$LINENO}: Package configured for: " >&5
 $as_echo "$as_me: Package configured for: " >&6;}
 { $as_echo "$as_me:${as_lineno-$LINENO}: OS type  : $host_os" >&5

configure.ac

@@ -2452,6 +2452,15 @@ echo "       \$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$.                "
 echo
 fi
 
+if test "x${AST_IODBC_FOUND}" = "xyes"; then
+	echo "WARNING: iodbc libs/headers found!"
+	echo
+	echo "  If you plan to use ODBC functionality, you should consider"
+	echo "  switching to unixodbc instead."
+	echo "  See: https://issues.asterisk.org/jira/browse/ASTERISK-22459"
+	echo
+fi
+
 AC_MSG_NOTICE(Package configured for: )
 AC_MSG_NOTICE( OS type  : $host_os)
 AC_MSG_NOTICE( Host CPU : $host_cpu)