travis: sf cert is invalid, so bottles don't work, return to makedepend

scripts/bootstrap-depends.sh

@@ -16,7 +16,8 @@ install -d ${PREFIX}/{lib,libexec,include,bin,sbin,man,share,etc,info,doc,var}
 DEPEND_CACHE="https://dl.dropboxusercontent.com/u/2255176/resolver-${TRRAVIS_OS_NAME}-cache.tar.lzma"
 PIP_PKGS="${TRAVIS_BUILD_DIR}/tests/pydnstest/requirements.txt cpp-coveralls"
 if [ "${TRAVIS_OS_NAME}" == "osx" ]; then
-	brew install python
+	brew install --force makedepend
+	brew install --force python
 	brew link --overwrite python
 	pip install --upgrade pip
 	pip install -r ${PIP_PKGS}