tests: convert first batch of tests from test-lib.sh to init.sh

Initially, I did this,
git grep -l srcdir/test-lib.sh|xargs perl -p0i -e '~180-byte script'
but that line would have been much longer than the maximum permitted
by coreutils' commit hook, and wasn't readable besides, so here's a
more readable version:

lhs=$(printf '%s\\n' \
'if test "$VERBOSE" = yes; then' \
'  set -x' \
'  touch --version' \
'fi' \
'' \
'. $srcdir/test-lib.sh' \
  | sed 's/\$/\\\$/g;s/touch/(\\w+)/')

rhs=$(printf '%s\\n' \
'. "${srcdir=.}/init.sh"; path_prepend_ ../src' \
'test "$VERBOSE" = yes && FIXME --version' \
  | sed 's/\$/\\\$/g;s/FIXME/\$1/')

git grep -l srcdir/test-lib.sh|xargs perl -p0i -e "s,$lhs,$rhs,"

tests/misc/split-a

@@ -16,12 +16,8 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-if test "$VERBOSE" = yes; then
-  set -x
-  split --version
-fi
-
-. $srcdir/test-lib.sh
+. "${srcdir=.}/init.sh"; path_prepend_ ../src
+test "$VERBOSE" = yes && split --version
 
 a_z='a b c d e f g h i j k l m n o p q r s t u v w x y z'