Merge bitcoin#8: Remove unused Homebrew workaround

fa04209 Remove HomeBrew workaround (MarcoFalke)

Pull request description:

  This reverts 9f0b997

  For context: bitcoin-core/univalue-subtree#4 (comment)
  The workaround was causing issues. Rather than working around those as well,
  just revert it altogether.

Tree-SHA512: 1692c71fd2e1e79d9585689484eadb0fea6f75bd71c5cbbf50012fcca733ee5107ebcf6857b0065baa5f0ad73e41d0b488a1e7327196d9ea196d9e9f7c66badb

.travis.yml

@@ -25,7 +25,6 @@ addons:
       - pkg-config
 
 before_script:
-  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew uninstall libtool; brew install libtool; fi
   - if [ -n "$USE_SHELL" ]; then export CONFIG_SHELL="$USE_SHELL"; fi
   - test -n "$USE_SHELL" && eval '"$USE_SHELL" -c "./autogen.sh"' || ./autogen.sh