build: remove bootstrap's --gnulib-srcdir option

...because it probably didn't work, and even if it did, we've
discovered that using a separate git repo like that can lead
to subtle mix-ups.
Also, fix invocation of gnulib-tool in daemon/.

bootstrap

@@ -4,18 +4,6 @@ usage() {
   echo >&2 "\
 Usage: $0 [OPTION]...
 Bootstrap this package from the checked-out sources.
-
-Options:
- --gnulib-srcdir=DIRNAME  Specify the local directory where gnulib
-                          sources reside.  Use this if you already
-                          have gnulib sources on your machine, and
-                          do not want to waste your bandwidth downloading
-                          them again.
-
-If the file bootstrap.conf exists in the current working directory, its
-contents are read as shell variables to configure the bootstrap.
-
-Running without arguments will suffice in most cases.
 "
 }
 
@@ -25,8 +13,6 @@ do
   --help)
     usage
     exit;;
-  --gnulib-srcdir=*)
-    GNULIB_SRCDIR=`expr "$option" : '--gnulib-srcdir=\(.*\)'`;;
   *)
     echo >&2 "$0: $option: unknown option"
     exit 1;;
@@ -35,30 +21,10 @@ done
 
 # Get gnulib files.
 
-case ${GNULIB_SRCDIR--} in
--)
-  echo "$0: getting gnulib files..."
-  git submodule init || exit $?
-  git submodule update || exit $?
-  GNULIB_SRCDIR=.gnulib
-  ;;
-*)
-  # Redirect the gnulib submodule to the directory on the command line
-  # if possible.
-  if test -d "$GNULIB_SRCDIR"/.git && \
-        git config --file .gitmodules submodule.gnulib.url >/dev/null; then
-    git submodule init
-    GNULIB_SRCDIR=`cd $GNULIB_SRCDIR && pwd`
-    git config --replace-all submodule.gnulib.url $GNULIB_SRCDIR
-    echo "$0: getting gnulib files..."
-    git submodule update || exit $?
-    GNULIB_SRCDIR=.gnulib
-  else
-    echo >&2 "$0: invalid gnulib srcdir: $GNULIB_SRCDIR"
-    exit 1
-  fi
-  ;;
-esac
+echo "$0: getting gnulib files..."
+git submodule init || exit $?
+git submodule update || exit $?
+GNULIB_SRCDIR=.gnulib
 
 ls po/*.po 2>/dev/null | sed 's|.*/||; s|\.po$||' > po/LINGUAS
 
@@ -78,7 +44,7 @@ sed '
 gnulib_tool=$GNULIB_SRCDIR/gnulib-tool
 <$gnulib_tool || exit
 
-(cd daemon && mkdir -p tests lib && $GNULIB_SRCDIR/../gnulib-tool --update)
+(cd daemon && mkdir -p tests lib && ../$gnulib_tool --update)
 
 modules='
 gitlog-to-changelog