switch default to uname -a

Author: remicollet

configure.ac

@@ -1273,7 +1273,7 @@ PHP_UNAME=${PHP_UNAME:-$UNAME}
 AC_DEFINE_UNQUOTED(PHP_UNAME,"$PHP_UNAME",[uname -a output])
 PHP_OS=`uname | xargs`
 AC_DEFINE_UNQUOTED(PHP_OS,"$PHP_OS",[uname output])
-PHP_BUILDER_SYSTEM=${PHP_BUILDER_SYSTEM:-$PHP_OS}
+PHP_BUILDER_SYSTEM=${PHP_BUILDER_SYSTEM:-$PHP_UNAME}
 AC_DEFINE_UNQUOTED(PHP_BUILDER_SYSTEM,"$PHP_BUILDER_SYSTEM",[builder uname output])
 
 PHP_SUBST_OLD(PHP_INSTALLED_SAPIS)