[tracker/sam/remove-libuuid] Update Meson requirement to 0.50.0

[Sam Thursfield <sthursfield src gnome org>]

commit d4f79634805a130759e3b60ef0a0b14047012e50
Author: Sam Thursfield <sam afuera me uk>
Date:   Wed Dec 4 20:57:57 2019 +0100

    Update Meson requirement to 0.50.0
    
    Meson 0.50.0 was released on 10th March 2019. We should
    now be able to depend on it.
    
    In particular, Freedesktop SDK now contains 0.51.0[1] so
    this shouldn't break gnome-build-meta like last time (13948fda052e).
    
    Fixes the following warnings:
    
        WARNING: Project specifies a minimum meson_version '>=0.47' but uses features which were added in 
newer versions:
         * 0.49.0: {'/ with string arguments'}
         * 0.50.0: {'install arg in configure_file'}
    
    1. https://gitlab.com/freedesktop-sdk/freedesktop-sdk/blob/master/elements%2Fcomponents%2Fmeson.bst

 meson.build                                    | 2 +-
 src/libtracker-data/tracker-turtle-reader.vala | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/meson.build b/meson.build
index 844e4728e..cd9cc0df4 100644
--- a/meson.build
+++ b/meson.build
@@ -1,6 +1,6 @@
 project('tracker', 'c', 'vala',
         version: '2.99.0',
-        meson_version: '>=0.47')
+        meson_version: '>=0.50')
 
 gnome = import('gnome')
 i18n = import('i18n')
diff --git a/src/libtracker-data/tracker-turtle-reader.vala b/src/libtracker-data/tracker-turtle-reader.vala
index f5f04cdb3..93962faa1 100644
--- a/src/libtracker-data/tracker-turtle-reader.vala
+++ b/src/libtracker-data/tracker-turtle-reader.vala
@@ -63,7 +63,7 @@ public class Tracker.TurtleReader : Object {
 
        int bnodeid = 0;
        // base UUID used for blank nodes
-       uchar[] base_uuid;
+       string base_uuid;
 
        MappedFile? mapped_file;
        uchar[]? buffer;
@@ -100,7 +100,7 @@ public class Tracker.TurtleReader : Object {
                } else {
                        var checksum = new Checksum (ChecksumType.SHA1);
                        // base UUID, unique per file
-                       checksum.update (base_uuid, -1);
+                       checksum.update ((uchar[]) base_uuid, -1);
                        // node ID
                        checksum.update ((uchar[]) user_bnodeid, -1);