t/test-on.sh: Don't quote "wc -l" output

t/test-on.sh: Don't quote "wc -l" output

Some wc(1) implementations, for example on OS X, prefix the numeric
output with spaces. So don't quote this output (and don't treat it
as a string) to not confuse WVPASSEQ.

This fixes the following error of "make check":

	Comparing:
	       2
	--
	2
	! t/test-on.sh:25  ' 2' = '2'                     FAILED
	 2.108s ok
	called from t/test-on.sh:25 WVPASSEQ        2 2
	make[1]: *** [runtests-cmdline] Error 1
	! Program returned non-zero exit code (2)         FAILED
	WvTest: 3007 tests, 1 failure, total time 84.013s.

Reported by Pedro Estarque, thanks!

Signed-off-by: Alexander Barton <alex@barton.de>
[rlb@defaultvalue.org: adjust commit message; add WVPASS calls]
Signed-off-by: Rob Browning <rlb@defaultvalue.org>
Reviewed-by: Rob Browning <rlb@defaultvalue.org>
Tested-by: Rob Browning <rlb@defaultvalue.org>