[smuxi/stable] Travis-CI: support Mono 4.5-only runtime

[Mirco M. M. Bauer <mmmbauer src gnome org>]

commit da3f97a05698b241b79ad2f731887665ca8da76b
Author: Mirco Bauer <meebey meebey net>
Date:   Mon Jan 18 18:19:24 2016 +0100

    Travis-CI: support Mono 4.5-only runtime

 .travis.yml |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)
---
diff --git a/.travis.yml b/.travis.yml
index 153bb66..33c4ea9 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -17,7 +17,12 @@ script:
     - sed 's!<Package>dbus-sharp-glib-2.0</Package>!<Package>dbus-sharp-glib-1.0</Package>!' -i 
src/Frontend-GNOME/Frontend-GNOME.csproj
     - sed 's!dbus-sharp, Version=2.0.0.0,!dbus-sharp, Version=1.0.0.0,!' -i 
src/Frontend-GNOME/Frontend-GNOME.csproj
     - sed 's!dbus-sharp-glib, Version=2.0.0.0,!dbus-sharp-glib, Version=1.0.0.0,!' -i 
src/Frontend-GNOME/Frontend-GNOME.csproj
-    - xbuild /p:Warn=0 src/smuxi.sln
+    - |
+      if test -e /usr/lib/mono/4.5/mscorlib.dll; then
+        xbuild /p:Warn=0 src/smuxi.sln
+      else
+        xbuild /p:Warn=0 src/smuxi.sln /p:TargetFrameworkVersion=v4.0
+      fi
     - nunit-console bin/release/smuxi-common-tests.dll
     - nunit-console bin/release/smuxi-engine-tests.dll || true
     - nunit-console bin/release/smuxi-frontend-tests.dll