libdw: Correct spelling of DW_LANG_PLI in dwarf.h.

The name used in the standard and other DWARF implementations for
Programming Language One, PL/I, is DW_LANG_PLI (not DW_LANG_PL1).

Fix usage in dwarf_aggregate_size.

Signed-off-by: Mark Wielaard <mjw@redhat.com>
diff --git a/libdw/ChangeLog b/libdw/ChangeLog
index cc92f16..978b991 100644
--- a/libdw/ChangeLog
+++ b/libdw/ChangeLog
@@ -1,3 +1,9 @@
+2016-10-22  Mark Wielaard  <mjw@redhat.com>
+
+	* dwarf.h: Correct spelling of DW_LANG_PLI. Add compatibility define.
+	* dwarf_aggregate_size.c (array_size): Use correct spelling of
+	DW_LANG_PLI.
+
 2016-11-02  Mark Wielaard  <mjw@redhat.com>
 
 	* cfi.c (execute_cfi): Add fallthrough comments.