record minimum version of meson that is needed

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

meson.build

diff --git a/meson.build b/meson.build
index ce291a3..2aef8c9 100644
--- a/meson.build
+++ b/meson.build
@@ -1,4 +1,4 @@
-project('qboot', 'c')
+project('qboot', 'c', meson_version: '>=0.49.0')
 
 cc = meson.get_compiler('c')
 objcopy = find_program('objcopy')