re-add libblkid dependency on libuuid

[Benny Siegert <bsiegert%gmail.com@localhost>]

Hi!

I would like to ask permission for the following change during the freeze:

Index: devel/libblkid/Makefile
===================================================================
RCS file: /cvsroot/pkgsrc/devel/libblkid/Makefile,v
retrieving revision 1.4
diff -u -r1.4 Makefile
--- devel/libblkid/Makefile     8 Dec 2017 08:03:35 -0000       1.4
+++ devel/libblkid/Makefile     31 Mar 2019 10:35:35 -0000
@@ -10,5 +10,5 @@
 CONFIGURE_ARGS+=       --enable-libblkid
 PKGCONFIG_OVERRIDE+=   libblkid/blkid.pc.in

-#.include "../../devel/libuuid/buildlink3.mk"
+.include "../../devel/libuuid/buildlink3.mk"
 .include "../../mk/bsd.pkg.mk"

This is to address the build failure seen in
https://us-east.manta.joyent.com/pkgsrc/public/reports/Linux/ubuntu14.04/trunk/x86_64/20190331.0003//hal-0.5.14nb21/configure.log

The last update commented out the libuuid dependency in Makefile but
not in buildlink3.mk. No matter if the dependency is required or not,
this is inconsistent and wrong.

Given that blkid.pc contains "Requires.private: uuid", it should be a
dependency.

-- 
Benny