pcre: bump to 8.40

PCRE 8.38 is not hosted anymore, bump to 8.40 to
fix the issue.

Change-Id: I4c9920f123a7bfd9176af6289a2eb4d3ac6d1b50
Reviewed-by: Alexandre Lision <alexandre.lision@savoirfairelinux.com>

contrib/src/pcre/SHA512SUMS

-ad3412ceee8f992787a3e7cbe0155ffba67affd4b2dfece6c4501dc8d2012f52dcc1ee1f56759362e04bbbd10ea9370b3e46f238e2f75005cb69f6c8439e52c0  pcre-8.38.tar.bz2
+b4c27eafbdf33bd7a1384655b1936f4be3bc6745c072347eb26e988896c52664bd85ac42444da1be78b6e20f45b6c7e5921f5f20f5b0741b5bd3d9844e5bd4e2  pcre-8.40.tar.bz2
\ No newline at end of file

contrib/src/pcre/rules.mak

 # Perl Compatible Regular Expression
 
-PCRE_VERSION := 8.38
+PCRE_VERSION := 8.40
 PCRE_URL := ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/pcre-$(PCRE_VERSION).tar.bz2
 
 PKGS += pcre