Manually install Test::Compile 2.1.2 for Travis CI (#635)

Seems to work, I'm merging this and add some comments in #622

.travis.yml

@@ -17,6 +17,8 @@ branches:
     - /^2\.\d{6}$/
     - 'master'
 install:
+  - wget https://github.com/egiles/test-compile/archive/v2.1.2.tar.gz
+  - cpanm -v v2.1.2.tar.gz 
   - cpanm --quiet --notest PkgConfig Test::CChecker Alien::zlib::Static Alien::OpenSSL::Static Alien::SNMP
 script: |
   perl Build.PL && \