In debug mode, use a different set of warning flags when building the
org.tigris compatibility JavaHL packages than for the org.apache packages.
In particular, do not yammer about unchecked interfaces and deprecated
names; the whole API is unchecked and deprecated, so those warnings are
just noise.

* build.conf (javahl-compat-java, javahl-compat-tests):
   Use a different compiler symbol than the other JavaHL targets.
* Makefile.in (COMPILE_JAVAHL_COMPAT_JAVAC, JAVAC_COMPAT_FLAGS): New.
* build/ac-macros/java.m4 (JAVAC_COMPAT_FLAGS): Define and export.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1544575 13f79535-47bb-0310-9956-ffa450edef68