Modifications to rxtx-2.1-7r2 to create rxtx-2.1-7r2-Java8 version

Initial Problems:

 i.  The RxTx code base is old, and really hasn't been touched in a long
     time.  It has no notion of any version of Java past Java 5 and will
     fail to build with any JDK with version 6 or later.
 ii. Again, do to its age, the RxTx build makes assumpotions about a
     system defined constant called UTS_RELEASE and where it can be found.
     This was originally assumed to be found in the <linux/version.h>
     include file.  Newer versions place this in a kernel module include
     file.  Without this constant defined, the RxTx build for additional
     communications support above simple serial communications (Parallel,
     RS485, I2C ...) will fail to build.


Version rxtx-2.1-7r2-Java8 modifications

1. Edited ./configure script at ~line 21448 and added this code immediately
   after the first line of check_kernel_headers() function:

  #
  # JTC: For recent versions of Linux, UTS_RELEASE is found in kernel module
  # include files, not as previously stated in <linux/version.h>.  Sometimes
  # kernel modules can be hard to get (e.g. Raspian)  As a workaround, create a
  # local "utsrelease.h" that source files can reference via `uname -r`
  # command
  # 
	  echo "#define UTS_RELEASE \""`uname -r`"\"" > utsrelease.h
	  cp utsrelease.h src/utsrelease.h


2. A few lines down, in the ./configure script at ~line 21462, immediately
   after the "#include <stdlib.h>" statement, add this line:

   #include "utsrelease.h"

   to the "conftest.c" test.


3. Move to the src/directory and edit the following files
   {SerialImp.c, RS485Imp.c, I2CImp.c, RawImp.c} the same way, adding
   the following code after the last include file in the source:

  /*
   * JTC:  Added this include statement so that modern linux'es compile this
   * source correctly.  The "utsrelease.h" file referenced below is created
   * by the configure command.
   */
  #include "utsrelease.h"


4. Edit Makefile.in and look for "CONFIG_CLEAN_FILES =" and replace it
   as follows:

  # JTC: Modified so 'make distclean' will remove these generated files
  #CONFIG_CLEAN_FILES =
  CONFIG_CLEAN_FILES = utsrelease.h src/utsrelease.h


5. Edit the ./configure script.  For all instances of:

	case $JAVA_VERSION in
	1.2*|1.3*|1.4*|1.5*)

   replace with

	case $JAVA_VERSION in
	1.2*|1.3*|1.4*|1.5*|1.6*|1.7*|1.8*)