[gtk-osx] Lock meson at 0.51.1

[John Ralls <jralls src gnome org>]

commit 9b45fa1b4de687f278b97f744fb29c2d0e9edc53
Author: John Ralls <jralls ceridwen us>
Date:   Thu Nov 14 15:02:58 2019 -0800

    Lock meson at 0.51.1
    
    52.0 adds a dependency on the lzma module and since MacOS doesn't
    provide liblzma the virtenv python doesn't build it. xz provides
    liblzma and the jbhuild built Pyton3 has lzma, but that doesn't do
    us any good for running meson.
    
    Fixes https://gitlab.gnome.org/GNOME/gtk-osx/issues/17

 gtk-osx-setup.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gtk-osx-setup.sh b/gtk-osx-setup.sh
index fd962fb..f761f78 100755
--- a/gtk-osx-setup.sh
+++ b/gtk-osx-setup.sh
@@ -141,7 +141,7 @@ verify_ssl = true
 
 [packages]
 six = "*"
-meson = "*"
+meson = {version="==0.51.1"}
 
 [scripts]
 jhbuild = "$DEVPREFIX/libexec/run_jhbuild.py"