Look in JAVA_LIBS for the system-wide java libraries rather than hard

coding the path to /usr/share/java. This allows us to set JAVA_LIBS to the
path to yolibs when building and running Narya code.


git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@858 542714f4-19e9-0310-aa3c-eee0fc999fb1

tests/bin/runjava

@@ -57,9 +57,11 @@ if (defined $libpath) {
 # put everything in our class path
 my $classpath = "-classpath $root/tests/dist/classes:$root/dist/classes";
 
-# add zip and jar files from our lib/ directory and the system lib/ directory
-my @dirs = ( "$root/lib", "/usr/share/java" );
+# add zip and jar files from our lib/ directory and the global Java
+# libraries directory
+my @dirs = ( "$root/lib", $ENV{"JAVA_LIBS"} );
 foreach $dir (@dirs) {
+    next unless (defined $dir);
     if (opendir(DIR, $dir)) {
         foreach $lib (grep { /.(zip|jar)/ && -f "$dir/$_" } readdir(DIR)) {
             $classpath .= ":$dir/$lib";