Upgrade pcre to pcre2-10.39

Test: make
Change-Id: I05a74df534efc6d9303ad035797fcf19e9c82bcd
diff --git a/Makefile.in b/Makefile.in
index fbaaf59..b0963f4 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -1,4 +1,4 @@
-# Makefile.in generated by automake 1.16.4 from Makefile.am.
+# Makefile.in generated by automake 1.16.5 from Makefile.am.
 # @configure_input@
 
 # Copyright (C) 1994-2021 Free Software Foundation, Inc.