Update to 3.52.9.

Changes upstream include:

• Added support for building on recent versions of Mac OS X
• Fixed warnings from autoconf/automake
• Fixed infinite loop in connection pool
• Fixed compiler warnings
• Fixed build dependency for make -jX
• Fixed check for Unicode driver
• Fixed issue calling SQLCancel from other thread
• Fixed SQLInstallDriverEx when driver is readonly

The "Fixed build dependency for make -jX" part is important, as parallel
builds (particularly with the GTK2 option on) normally fail with 3.52.8.

Based on a patch by Jia-Shiun Li <jiashiun@gmail.com> [1].

PR: ports/189496 [1]
Submitted by: Jia-Shiun Li <jiashiun@gmail.com> [1]
MFH: 2014Q2