[libgudev] tests: Preload umockdev before running tests

[Bastien Nocera <hadess src gnome org>]

commit 177ea07f3411353d9eb964b4d9c0812685d71738
Author: Bastien Nocera <hadess hadess net>
Date:   Wed Nov 2 18:30:45 2016 +0100

    tests: Preload umockdev before running tests
    
    Otherwise it's as if we were outside the test environment, which we
    don't want to be.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=773224

 Makefile.decl |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/Makefile.decl b/Makefile.decl
index aab33c3..ea39c7a 100644
--- a/Makefile.decl
+++ b/Makefile.decl
@@ -1,4 +1,5 @@
-GTESTER        = gtester               # in $PATH for non-GLIB packages
+# Note, we need this set for umockdev to be available in tests
+GTESTER        = env LD_PRELOAD=libumockdev-preload.so.0: gtester              # in $PATH for non-GLIB 
packages
 GTESTER_REPORT = gtester-report                # in $PATH for non-GLIB packages
 
 # initialize variables for unconditional += appending