[iagno] Fix build of perfs-tests-generator.vala

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 0100bab269f2102f24a6e41202b931da1b6e8dc5
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Mon Aug 3 13:47:43 2020 -0500

    Fix build of perfs-tests-generator.vala
    
    Not sure exactly what changed, but Rico says: "likely a dependency isn't
    pulling posix.vapi in anymore."

 src/meson.build | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/src/meson.build b/src/meson.build
index f3d3a20..9925272 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -15,7 +15,8 @@ run_target('update-perfs-tests', command: executable ('iagno-perfs-tests-generat
             '--enable-experimental-non-null'
         ],
         dependencies : [
-            gio_dependency
+            gio_dependency,
+            posix_dependency
         ]
     )
 )