RelNotes: add details on Perl module changes

Document changes to core and non-core Perl module handling in 2.17.

Signed-off-by: Todd Zullinger <tmz@pobox.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/RelNotes/2.17.0.txt

@@ -75,6 +75,20 @@ Performance, Internal Implementation, Development Support etc.
  * The build procedure for perl/ part has been greatly simplified by
    weaning ourselves off of MakeMaker.
 
+ * Perl 5.8 or greater has been required since Git 1.7.4 released in
+   2010, but we continued to assume some core modules may not exist and
+   used a conditional "eval { require <<module>> }"; we no longer do
+   this.  Some platforms (Fedora/RedHat/CentOS, for example) ship Perl
+   without all core modules by default (e.g. Digest::MD5, File::Temp,
+   File::Spec, Net::Domain, Net::SMTP).  Users on such platforms may
+   need to install these additional modules.
+
+ * As a convenience, we install copies of Perl modules we require which
+   are not part of the core Perl distribution (e.g. Error and
+   Mail::Address).  Users and packagers whose operating system provides
+   these modules can set NO_PERL_CPAN_FALLBACKS to avoid installing the
+   bundled modules.
+
  * In preparation for implementing narrow/partial clone, the machinery
    for checking object connectivity used by gc and fsck has been
    taught that a missing object is OK when it is referenced by a

INSTALL

@@ -126,7 +126,8 @@ Issues of note:
 	  Redhat/Fedora are reported to ship Perl binary package with some
 	  core modules stripped away (see http://lwn.net/Articles/477234/),
 	  so you might need to install additional packages other than Perl
-	  itself, e.g. Time::HiRes.
+	  itself, e.g. Digest::MD5, File::Spec, File::Temp, Net::Domain,
+	  Net::SMTP, and Time::HiRes.
 
 	- git-imap-send needs the OpenSSL library to talk IMAP over SSL if
 	  you are using libcurl older than 7.34.0.  Otherwise you can use