Bundle a built-from-source Mac OS X sqlite3 universal dylib with OpenSim and use this instead of the system one.

This means that Mac OS X users can now use the standard sqlite adaptor instead of the legacy one.
This is SQLite 3.7.5.  I configured the build with the line

CFLAGS="-Os -g -isysroot /Developer/SDKs/MacOSX10.6.sdk -arch i386 -arch x86_64 -arch ppc7400 -DSQLITE_ENABLE_COLUMN_METADATA" LDFLAGS="-arch i386 -arch x86_64 -arch ppc7400" ./configure --disable-dependency-tracking

The SQLITE_ENABLE_COLUMN_METADATA flag exports the metadata symbols that modern Mono SQLite adaptors need.
The -Os removes debugging symbols (as per the sqlite3 source pkg README)
The other parts are to cross compile for x86_64, i386 and ppc.  On Mac OS X, Mono can actually only P/INVOKE 32-bit libraries even on 64 bit platforms so i386 is being used.  The dylib has not been tested on ppc.

bin/Mono.Data.Sqlite.dll.config

@@ -1,4 +1,5 @@
 <configuration>
+  <dllmap os="osx" dll="sqlite3" target="./libsqlite3.dylib" />
   <dllmap os="!windows,osx" cpu="x86-64,ia64" wordsize="64" dll="sqlite3" target="./libsqlite3_64.so" />
   <dllmap os="!windows,osx" cpu="x86" wordsize="32" dll="sqlite3" target="./libsqlite3_32.so" />
 </configuration>