[Rd] R CMD config doesn't export JAVA_LD_LIBRARY_PATH (PR#13165)

[chakj at stanford.edu]

R CMD config exports the following variables:

   JAR           Java archive tool command
   JAVA          Java interpreter command
   JAVAC         Java compiler command
   JAVAH         Java header and stub generator command
   JAVA_HOME     path to the home of Java distribution
   JAVA_LIBS     flags needed for linking against Java libraries
   JAVA_CPPFLAGS C preprocessor flags needed for compiling JNI programs

JAVA_LD_LIBRARY_PATH is defined in Makeconf, but not exported. 
Specifically, src/scripts/config includes the following line:
ok_java_vars="JAVA JAVAC JAVAH JAR JAVA_HOME JAVA_LIBS JAVA_CPPFLAGS"

This list does not include JAVA_LD_LIBRARY_PATH, with no explanation of 
why not. Providing this env variable would allow developers to use RPATH 
instead of setting the LD_LIBRARY_PATH variable by hand before running R 
extensions that use Java.

--please do not edit the information below--

Version:
  platform = x86_64-pc-linux-gnu
  arch = x86_64
  os = linux-gnu
  system = x86_64, linux-gnu
  status =
  major = 2
  minor = 7.1
  year = 2008
  month = 06
  day = 23
  svn rev = 45970
  language = R
  version.string = R version 2.7.1 (2008-06-23)

Locale:
LC_CTYPE=en_US.UTF-8;LC_NUMERIC=C;LC_TIME=en_US.UTF-8;LC_COLLATE=en_US.UTF-8;LC_MONETARY=C;LC_MESSAGES=en_US.UTF-8;LC_PAPER=en_US.UTF-8;LC_NAME=C;LC_ADDRESS=C;LC_TELEPHONE=C;LC_MEASUREMENT=en_US.UTF-8;LC_IDENTIFICATION=C

Search Path:
  .GlobalEnv, package:stats, package:graphics, package:grDevices, 
package:utils, package:datasets, package:methods, Autoloads, package:base