[m-rev.] diff: drop support for older alternative Java compilers

[Julien Fischer]

Drop support for older alternative Java compilers.

m4/mercury.m4:
     Do not check for jikes or gcj.  Neither supports Java 1.8 or
     is updated anymore.

Julien.

diff --git a/m4/mercury.m4 b/m4/mercury.m4
index 3dcd925..a3c17cc 100644
--- a/m4/mercury.m4
+++ b/m4/mercury.m4
@@ -497,25 +497,17 @@ AC_SUBST([CLI_INTERPRETER])
  #
  AC_DEFUN([MERCURY_CHECK_JAVA],
  [
-# jikes requires the usual Java SDK to run, so if we checked for javac first,
-# then that is what we would get. If the user has jikes installed, then that
-# probably means that they want to use it, so we check for jikes before javac.
  # On Windows, the Java SDK has a high chance of being installed in a path
  # containing spaces. The simplest solution is to keep only the basename.
  # Everything will still work so long as the executables can be found on the
  # PATH later.
-AC_PATH_PROGS(JAVAC, jikes javac gcj)
+AC_PATH_PROGS(JAVAC, javac)
  case "$JAVAC" in
      *" "*)
          JAVAC=`basename "$JAVAC"`
          ;;
  esac
-case "$JAVAC" in
-    *gcj)
-        JAVAC="$JAVAC -C"
-        ;;
-esac
-AC_PATH_PROG(JAVA_INTERPRETER, java gij)
+AC_PATH_PROG(JAVA_INTERPRETER, java)
  case "$JAVA_INTERPRETER" in
      *" "*)
          JAVA_INTERPRETER=`basename "$JAVA_INTERPRETER"`