dbus: add patch to fix cmake tmp session search

The tmp file location cannot be set explicitly. It is set incorrectly by
cmake. This patch only searches for this location if it is not specified
via the build system. Without this change, the cross compile value is
not correct set on target in the file /usr/share/dbus-1/session.conf.

Signed-off-by: Florian Eckert <fe@dev.tdt.de>

utils/dbus/patches/020-cmake-fix-tmp-session-search.patch

@@ -0,0 +1,27 @@
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -471,14 +471,16 @@ endif()
+ 
+ #### Find socket directories
+ if(UNIX)
+-    if(NOT $ENV{TMPDIR} STREQUAL "")
+-        set(DBUS_SESSION_SOCKET_DIR $ENV{TMPDIR})
+-    elseif(NOT $ENV{TEMP} STREQUAL "")
+-        set(DBUS_SESSION_SOCKET_DIR $ENV{TEMP})
+-    elseif(NOT $ENV{TMP} STREQUAL "")
+-        set(DBUS_SESSION_SOCKET_DIR $ENV{TMP})
+-    else()
+-        set(DBUS_SESSION_SOCKET_DIR /tmp)
++    if(NOT DEFINED DBUS_SESSION_SOCKET_DIR)
++        if(NOT $ENV{TMPDIR} STREQUAL "")
++            set(DBUS_SESSION_SOCKET_DIR $ENV{TMPDIR})
++        elseif(NOT $ENV{TEMP} STREQUAL "")
++            set(DBUS_SESSION_SOCKET_DIR $ENV{TEMP})
++        elseif(NOT $ENV{TMP} STREQUAL "")
++            set(DBUS_SESSION_SOCKET_DIR $ENV{TMP})
++        else()
++            set(DBUS_SESSION_SOCKET_DIR /tmp)
++        endif()
+     endif()
+ endif()
+