Fix JibxMarshallerTests failing on Windows

Before this change JibxMarshallerTests would fail on Windows with error
message explaining that JiBX compiler generated classes are not found
on classpath for binding with name 'binding'. Tests would execute well
on Linux.

Actual root cause of this bug is found to be in JiBX 1.1.5 release that
is used to build Spring. Binding name can be explicitly specified in
JiBX binding file. If omitted, when generating classes JiBX compiler as
fall-back mechanism tries to derive binding name from binding file
name. That logic had bug which gets manifested when configured binding
file path has mixed Windows and Linux style file separators, as in case
when mentioned JibxMarshallerTests are executed on Windows platform.

This change introduces one of the two possible solutions - binding name
is specified explicitly in binding.xml file so JiBX doesn't have to use
the fall-back mechanism.

Issue: SPR-8360

Author: sslavic

spring-oxm/src/test/resources/org/springframework/oxm/jibx/binding.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<binding>
+<binding name="binding">
     <mapping name="flights" class="org.springframework.oxm.jibx.Flights">
         <namespace uri="http://samples.springframework.org/flight" default="elements"/>
         <collection field="flightList">