Force 'E' to be present in php.ini so environment variables are picked up

This is needed as run-tests provides its own environment to tests using
proc_open().

Since we use 'make tests', the only way of injecting environment
variable usage is by forcing it for the instanciating php process,
which we can only do via php.ini since we are running run-tests through
the 'tests' make target.

Author: bjori

.travis.yml

@@ -24,6 +24,7 @@ before_install:
   - sudo apt-get install -y mongodb-org
   - sudo apt-get install gdb valgrind
   - sudo apt-get install cdbs debhelper build-essential python-lxml
+  - php -r 'if ( ! ($f = php_ini_loaded_file())) { $f = PHP_CONFIG_FILE_PATH . "/php.ini"; } file_put_contents($f, "variables_order=EGPCS\n", FILE_APPEND); $a = file($f, FILE_IGNORE_NEW_LINES); var_dump($a[count($a)-1]);'
 
 before_script:
   - ulimit -a