Revert attempt at supporting both autoconf 2.13 and

modern versions in the same build chain.  There are
simply too many broken things in 2.13 to make it work.
Cache handling is broken as well which is why I need
to revert the pdo_inc_path cache fix as well.

trunk is now 2.60+ only and I'll work on cleaning out
all the legacy cruft from there.

config.m4

@@ -17,32 +17,32 @@ if test "$PHP_PDO_4D" != "no"; then
   ],[
     AC_MSG_CHECKING([for PDO includes])
     if test -f $abs_srcdir/include/php/ext/pdo/php_pdo_driver.h; then
-      pdo_cv_inc_path=$abs_srcdir/ext
+      pdo_inc_path=$abs_srcdir/ext
     elif test -f $abs_srcdir/ext/pdo/php_pdo_driver.h; then
-      pdo_cv_inc_path=$abs_srcdir/ext
+      pdo_inc_path=$abs_srcdir/ext
     elif test -f $prefix/include/php/ext/pdo/php_pdo_driver.h; then
-      pdo_cv_inc_path=$prefix/include/php/ext
+      pdo_inc_path=$prefix/include/php/ext
     else
       AC_MSG_ERROR([Cannot find php_pdo_driver.h.])
     fi
-    AC_MSG_RESULT($pdo_cv_inc_path)
+    AC_MSG_RESULT($pdo_inc_path)
   ])
-  	PHP_ADD_INCLUDE($pdo_cv_inc_path)
-	PHP_ADD_INCLUDE("$pdo_cv_inc_path/pdo")
+  	PHP_ADD_INCLUDE($pdo_inc_path)
+	PHP_ADD_INCLUDE("$pdo_inc_path/pdo")
 
 	if test "$PHP_PDO_4D" != "yes"; then
 		PDO_4D_DIR=$PHP_PDO_4D
 		PHP_ADD_INCLUDE("$PHP_PDO_4D/include")
 		PHP_ADD_LIBRARY_WITH_PATH(4d_sql, "$PDO_4D_DIR/lib", PDO_4D_SHARED_LIBADD)
 
 		AC_DEFINE(HAVE_PDO_4D,1,[ ])
-		PHP_NEW_EXTENSION(pdo_4d, pdo_4d.c 4d_driver.c 4d_statement.c, $ext_shared,,-I$pdo_cv_inc_path)
+		PHP_NEW_EXTENSION(pdo_4d, pdo_4d.c 4d_driver.c 4d_statement.c, $ext_shared,,-I$pdo_inc_path)
     else
     	#use bundled lib4d_sql
     	pdo_4d_sources=" pdo_4d.c 4d_driver.c 4d_statement.c"
     	lib4d_sql_sources="lib4d_sql/base64.c lib4d_sql/communication.c lib4d_sql/fourd.c lib4d_sql/fourd_interne.c lib4d_sql/fourd_result.c lib4d_sql/fourd_type.c lib4d_sql/sqlstate.c lib4d_sql/utils.c"
 
-		PHP_NEW_EXTENSION(pdo_4d, $lib4d_sql_sources $pdo_4d_sources, $ext_shared,,-I$pdo_cv_inc_path -I@ext_srcdir@/lib4d_sql)
+		PHP_NEW_EXTENSION(pdo_4d, $lib4d_sql_sources $pdo_4d_sources, $ext_shared,,-I$pdo_inc_path -I@ext_srcdir@/lib4d_sql)
     	PHP_ADD_BUILD_DIR($ext_builddir/lib4d_sql)
 
 		AC_DEFINE(HAVE_PDO_4D,1,[ ])