[BRLTTY] can't compile java bindings on latest master

[Alexander Epaneshnikov]

trying to build brltty on commit 42a5e14fe

I am getting:
make[2]: Entering directory 
'/home/alex/repos/pkgbuilds/brltty-git/src/brltty/Bindings/Java'
gawk -f ../../Programs/brlapi.awk -f ./constants.awk -f 
../../Programs/brl_cmds.awk ./../../Programs/brlapi.h 
../../Programs/brlapi_keycodes.h ../../Programs
/brlapi_param.h ../../Headers/brl_cmds.h ../../Headers/brl_custom.h 
 >Constants.java
/usr/bin/install -c -d classes
'/usr/lib/jvm/java-8-openjdk/bin/javac' -encoding UTF-8 
-Xlint:cast,deprecation,fallthrough,finally,overrides,rawtypes,unchecked 
-d classes -classpath . Cons
tants.java ./*.java ./*/*.java
./Constants.java:3: error: duplicate class: org.a11y.brlapi.Constants
public interface Constants {
        ^
1 error
make[2]: *** [Makefile:90: classes.made] Error 1
make[2]: Leaving directory 
'/home/alex/repos/pkgbuilds/brltty-git/src/brltty/Bindings/Java'
make[1]: *** [Makefile:729: all-api-bindings] Error 1
make[1]: Leaving directory 
'/home/alex/repos/pkgbuilds/brltty-git/src/brltty/Programs'
make: *** [Makefile:49: all] Error 2
==> ERROR: A failure occurred in build().

-- 
Sincerely, Alexander.