Stop building ihaskell-* with 7.8.*

.travis.yml

@@ -39,7 +39,7 @@ install:
 # Here starts the actual work to be performed for the package under test; any command which exits with a non-zero exit code causes the build to fail.
 script:
  - |
-   if [[ ${GHCVER%.*} == "7.8" || ${GHCVER%.*} == "7.10" ]]; then
+   if [[ ${GHCVER%.*} == "7.10" ]]; then
      travis_retry ./build.sh all
    else
      travis_retry ./build.sh ihaskell