fix fixupmessages warning

Signed-off-by: Christoph Rueger <chrisrueger@gmail.com>

Author: chrisrueger

cnf/build.bnd

@@ -53,7 +53,7 @@ Bundle-Version:         ${base.version}.${tstamp}-SNAPSHOT
 	sign;keyname=${env;GPG_KEY_ID};passphrase=${env;GPG_PASSPHRASE}
 
 # supress the warning if keyname/passphrase is empty. needed to avoid failing the build
--fixupmessages.releasesign: No value after '=' sign for attribute (passphrase|keyname)
+-fixupmessages.releasesign: "No value after '=' sign for attribute (passphrase|keyname)"
 
 gpg: gpg --homedir ${def;USERHOME;~}/.gnupg --pinentry-mode loopback