Remove probably unneeded spurious define

kadler points out this wouldn't have triggered on PASE, which should
have in theory the same issues as AIX. We'll have to see if this
breaks AIX LUW.

Author: NattyNarwhal

config.m4

@@ -71,11 +71,6 @@ if test "$PHP_PDO_IBM" != "no"; then
   dnl Don't forget to add additional source files here
   php_pdo_ibm_sources_core="pdo_ibm.c ibm_driver.c ibm_statement.c"
 
-  case "$host_alias" in
-    *aix*)
-      CPPFLAGS="$CPPFLAGS -D__H_LOCALEDEF";;
-  esac
-
   dnl Convert the includes to __PASE__ (for IBM-shipped GCC) or use AC_DEFINE
   if test "$PDO_IBM_PASE" = "yes" ; then
     PHP_NEW_EXTENSION(pdo_ibm, $php_pdo_ibm_sources_core, $ext_shared,,-I$pdo_cv_inc_path -DPASE)