fix file size in test-mu-guile.scm changed by e97ec2d5

Signed-off-by: Chirantan Ekbote <chirantan.ekbote@gmail.com>
Merge pull request #231 from jynnantonix/guile-test

* fix file size in test-mu-guile.scm
* try harder to match special strings
* configure.ac: report on guile version
* update some unit tests
* minor