botan: changed build priority (104.600 -> 109.100) to be build after python (see note)

Note:

Botan uses a custom configuration system, where the old implementation was done
in perl but the newer, recommended configure script is written python.

The python version we use since commit b8d2819e4f
of the package tree, so we need to build botan after python for having a python
interpreter available in the build.

security/botan/botan.desc

@@ -30,7 +30,7 @@
 [L] BSD
 [S] Stable
 [V] 1.8.9
-[P] X -----5---9 104.600
+[P] X -----5---9 109.100
 
 [D] 30070263 Botan-1.8.9.tbz http://files.randombit.net/botan/