Add "resources/" as a source folder

Building jgit with pde.build was broken without resources.

Bug:315823
Change-Id: I45be510ada068b3ffab0feb30ec60f2c96a5ca32
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit/build.properties

@@ -1,6 +1,7 @@
-source.. = src/
+source.. = src/,\
+               resources/
 output.. = bin/
 bin.includes = META-INF/,\
                .,\
                about.html,\
-               plugin.properties
+               plugin.properties