sim/testsuite/cris/c: Use -sim3 but only for newlib targets

Commit a39487c6685f "sim: cris: use -sim with C tests for cris-elf
targets" caused " -sim" to be appended to CFLAGS_FOR_TARGET for
cris*-*-elf, where testing had until then relied on
"RUNTESTFLAGS=--target_board=cris-sim" being passed when running "make
check-sim", adding the right options.  While "-sim" happens to work,
the baseboard-file cris-sim.exp uses "-sim3" so for consistency use
that instead.

Then commit b42f20d2ac72 "sim: testsuite: drop most specific istarget
checks" caused " -sim" to be appended for *all* targets, which just
doesn't work.  For example, for crisv32-linux-gnu, that's not a
recognized option and will cause a dejagnu error and further testing
in c.exp will be aborted.

While cris-sim.exp appends "-static" for *-linux-gnu, further changes
in the test-suite have caused "linux"-specific tests to break, so that
part will be tended to separately.

But, save and restore CFLAGS_FOR_TARGET around the modification and
use where needed, to not have the CRIS-specific modification affect a
continuing test-run (possibly for other targets).

sim/testsuite/cris:
	* c/c.exp (CFLAGS_FOR_TARGET): Replace appended option " -sim"
	with " -sim3", but do it conditionally for newlib targets.  Save
	and restore CFLAGS_FOR_TARGET in saved_CFLAGS_FOR_TARGET such
	that it doesn't affect the value of CFLAGS_FOR_TARGET outside
	c.exp.

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