Add resources/ as source folder in build.properties

This allows correct export of org.eclipse.jgit.pgm via the PDE Export
wizard.

Bug: 419089
Change-Id: I98765208edd7df59e262001dd01ed2b43e4475a9
Signed-off-by: Kaloyan Raev <kaloyan.r@zend.com>

org.eclipse.jgit.pgm/build.properties

@@ -1,4 +1,5 @@
-source.. = src/
+source.. = src/,\
+           resources/
 output.. = bin/
 bin.includes = META-INF/,\
                .,\