THRIFT-647. php: Add license header and fix style in Makefile.am

The attachment was made with the "licensed for inclusion" option, so it
should get a standard Apache license header.  Our other makefiles use
$() style for variables and don't include extra spaces before
backslashes.

git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@940936 13f79535-47bb-0310-9956-ffa450edef68
1 file changed