Remove non-existing INI directive detect_unicode (php#18909)

The detect_unicode was removed and zend.detect_unicode was added in PHP
5.4 (bbf3d43).

Author: petk

ext/phar/tests/zip/notphar.phpt

@@ -4,7 +4,6 @@ Phar: a non-executable zip with no stub named .phar.zip
 phar
 --INI--
 phar.readonly=1
-detect_unicode=0
 zend.multibyte=0
 --FILE--
 <?php

pear/Makefile.frag

@@ -1,7 +1,7 @@
 peardir=$(PEAR_INSTALLDIR)
 
 # Skip all php.ini files altogether
-PEAR_INSTALL_FLAGS = -n -dshort_open_tag=0 -dopen_basedir= -derror_reporting=1803 -dmemory_limit=-1 -ddetect_unicode=0
+PEAR_INSTALL_FLAGS = -n -dshort_open_tag=0 -dopen_basedir= -derror_reporting=1803 -dmemory_limit=-1
 
 WGET = `which wget 2>/dev/null`
 FETCH = `which fetch 2>/dev/null`