travis: fix pkg-config in mac builds

Unlink pkg-config before installing.

diff --git a/.travis.yml b/.travis.yml
index 45c53cda71b92db32f7f46b58199402330bbff00..168454fc22ea9952fe1e929f7f953d32a541a90b 100644 (file)
--- a/.travis.yml
+++ b/.travis.yml
@@ -129,6 +129,7 @@ before_install:
 
         # Unlink pcre in case its already installed.
         brew unlink pcre || true
+        brew unlink pkg-config || true
 
         brew install pkg-config libmagic libyaml nss nspr jansson libnet lua \
             pcre hiredis