bootstrap.ci: stop playing with unused PACKAGE_VERSION_REVISION

PACKAGE_VERSION_REVISION is not used outside bootstrap.ci;
remove everything  that deals with it.

bootstrap.ci

@@ -10,8 +10,6 @@ OPTIONS:
    -h      Show this message
    -s      Package suffix
    -S      Use package suffix as 'g' appended with the date of last commit
-   -r      Package version revision
-   -R      Use package version revision as Git commit number from 'git describe' result
    -b      Package branch
    -B      Use package branch as current Git branch
 EOF
@@ -19,10 +17,9 @@ EOF
 
 
 SUFFIX=
-REVISION=
 VERBOSE=
 KEEPVERSION=
-while getopts “:hs:Sr:RK” OPTION
+while getopts “:hs:SK” OPTION
 do
      case $OPTION in
          h)
@@ -35,12 +32,6 @@ do
          S)
              SUFFIX=g`git log -1 --pretty=fuller --date=iso | grep CommitDate: | sed -E 's/^CommitDate:\s(.*)/\1/' | sed -E 's/(.*)-(.*)-(.*) (.*):(.*):(.*)\s+.*/\1\2\3\4\5\6/'`
              ;;
-         r)
-             REVISION=$OPTARG
-             ;;
-         R)
-             REVISION=`git describe | perl -ne 'print $1 if /^[\.0-9]*([-~]rc[0-9]+)?-([0-9]*)-g[a-z0-9]*$/;'`
-             ;;
          ?)
              usage
              exit
@@ -56,24 +47,10 @@ fi
 
 rm -rf *~ *.cache config.guess config.log config.status config.sub depcomp ltmain.sh version.m4.ci
 
-if [ -n "$SUFFIX" ] || [ -n "$REVISION" ]
+if [ -n "$SUFFIX" ]
 then
-    cp -a version.m4 version.m4.tmp
-
-    if [ -n "$SUFFIX" ]
-    then
-        echo Set package suffix "$SUFFIX"
-        sed 's/^define(\[PACKAGE_SUFFIX\],\s*\[\([-~]*[0-9a-zA-Z]*\)\])$/define(\[PACKAGE_SUFFIX\], \['$SUFFIX'\])/g' version.m4.tmp > version.m4.ci
-        cp version.m4.ci version.m4.tmp
-    fi
-
-    if [ -n "$REVISION" ]
-    then
-        echo Set package revision "$REVISION"
-        sed 's/^define(\[PACKAGE_VERSION_REVISION\],\s*\[\([-~]*[0-9a-zA-Z]*\)\])$/define(\[PACKAGE_VERSION_REVISION\], \['$REVISION'\])/g' version.m4.tmp > version.m4.ci
-    fi
-
-    rm -f version.m4.tmp
+    echo Set package suffix "$SUFFIX"
+    sed 's/^define(\[PACKAGE_SUFFIX\],\s*\[\([-~]*[0-9a-zA-Z]*\)\])$/define(\[PACKAGE_SUFFIX\], \['$SUFFIX'\])/g' < version.m4 > version.m4.ci
 fi
 
 ./bootstrap