spell ldscript correctly in outputs.exp et al

spell ldscript correctly in outputs.exp et al

In my recent changes to outputs.exp and gcc-defs.exp, I misreferenced
dejagnu board property ldscript, singular, as ldscripts, plural.

This probably didn't have much impact on gcc-defs.exp: the code there
would just prefix with -Wl, any options that amounted to file names,
and linker scripts probably wouldn't be named without a -T or even an
-Wl,-T, prefix.

The visible effects were in outputs.exp, that also intended to add the
ldscript, if present, to the set of options to be passed to the
compiler driver for linking.  Using the wrong option name, that
wouldn't work.

for  gcc/testsuite/ChangeLog

	* gcc.misc-tests/outputs.exp: Spell ldscript correctly.
	* lib/gcc-defs.exp (gcc_adjust_linker_flags): Likewise.