Revert "Merge branch 'master' of https://github.com/mono/mono"

This reverts commit 9dd632fb9e7197d278bd99152c1c67c6ab51a207, reversing
changes made to 164f9cbec4f79cc013c7b1cf674e70e4573f4b36.
Revert "Mono version is now pulled in to configure.in from MONO_VERSION"

This reverts commit 164f9cbec4f79cc013c7b1cf674e70e4573f4b36.