bpo-32901: update macOS 10.9+ installer to Tcl/Tk 8.6.8
diff --git a/Mac/BuildScript/build-installer.py b/Mac/BuildScript/build-installer.py
index bacdbfb..7f6228b 100755
--- a/Mac/BuildScript/build-installer.py
+++ b/Mac/BuildScript/build-installer.py
@@ -225,9 +225,9 @@
     if internalTk():
         result.extend([
           dict(
-              name="Tcl 8.6.7",
-              url="ftp://ftp.tcl.tk/pub/tcl//tcl8_6/tcl8.6.7-src.tar.gz",
-              checksum='5673aaf45b5de5d8dd80bb3daaeb8838',
+              name="Tcl 8.6.8",
+              url="ftp://ftp.tcl.tk/pub/tcl//tcl8_6/tcl8.6.8-src.tar.gz",
+              checksum='81656d3367af032e0ae6157eff134f89',
               buildDir="unix",
               configure_pre=[
                     '--enable-shared',
@@ -241,9 +241,12 @@
                   },
               ),
           dict(
-              name="Tk 8.6.7",
-              url="ftp://ftp.tcl.tk/pub/tcl//tcl8_6/tk8.6.7-src.tar.gz",
-              checksum='46ea9c0165c515d87393700f4891ab6f',
+              name="Tk 8.6.8",
+              url="ftp://ftp.tcl.tk/pub/tcl//tcl8_6/tk8.6.8-src.tar.gz",
+              checksum='5e0faecba458ee1386078fb228d008ba',
+              patches=[
+                  "tk868_on_10_8_10_9.patch",
+                   ],
               buildDir="unix",
               configure_pre=[
                     '--enable-aqua',