[bug #44768] gdiffmk(1) is not Solaris 10 /bin/sh compatible - PATCH provided

[Michael H Bianchi]

Follow-up Comment #13, bug #44768 (project groff):

I _think_ I successfully committed the changes, but I doubt the 
result is completely Solaris 10 compatible.

ChangeLog entry ...
2015-04-13  Mike Bianchi <address@hidden>
        More fixes to Savannah bug #44768.

        * gdiffmk.sh:
                replace
                        for OPTION   with  while [ $# -gt 0 ]

                        test -e ...  with  test -f

                        use  ${DIFFCMD}  for the last  diff
                add
                        -s SEDCMD  option
                        OPTION="$1"

                many other cosmetic changes documented in the bug Discussion.
                especially:
                        capitalize variables  e.g.  CMD=`basename $0`
 
        fix  make check  tests within gdiffmk
        * tests/gdiffmk_tests.sh
                add  set -e
                        fails if ${abs_top_builddir} not set or incorrect

        * tests/runtests.sh
                add test 6a
                        # Different values for addmark, changemark,
deletemark
                        # Alternate format of -a -c and -d flag arguments

                add test 9a
                        # Test -D  and  -M  options
                        # Alternate format of -M argument.

                add printout of failure count
                add exit with failure exit_code if any test fails


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