[sysprof] libsysprof: allow changing envvar from init and after

[Christian Hergert <chergert src gnome org>]

commit dcd1a9fbcf3ea828af3fbc86b3ea054921640f8e
Author: Christian Hergert <chergert redhat com>
Date:   Mon Jun 3 19:09:30 2019 -0700

    libsysprof: allow changing envvar from init and after

 src/libsysprof/sysprof-tracefd-source.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/libsysprof/sysprof-tracefd-source.c b/src/libsysprof/sysprof-tracefd-source.c
index 6cbf1f0..fdd49f8 100644
--- a/src/libsysprof/sysprof-tracefd-source.c
+++ b/src/libsysprof/sysprof-tracefd-source.c
@@ -119,7 +119,7 @@ sysprof_tracefd_source_class_init (SysprofTracefdSourceClass *klass)
                          "Environment Variable",
                          "The environment variable to set",
                          "SYSPROF_TRACE_FD",
-                         (G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_STRINGS));
+                         (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
   
   g_object_class_install_properties (object_class, N_PROPS, properties);
 }