Bug 730878 - Split libcamelews into a static and a dynamic library

After the initial change within	bug 730878, which made the libcamelews
a module, the module-ews-configuration also linking into it was
producing a warning during compile time:
   *** Warning: Linking the shared library module-ews-configuration.la
   *** against the loadable module libcamelews.so is not portable!
To avoid this warning I	split the libcamelews into a statis and
a dynamic library and made the module-ews-configuration	link against
the static library.