awk: Fix the tests

I'd forgotten that we have to adjust the stderr tests from
upstream. Remove the OK files. Also remove system-status.*.  These
restore the fixes I made in 517e52b6c2 which were lost when I imported
the last version of awk.

Also, force LANG to be C.UTF-8 when testing to ensure that stray lang
settings don't fail tests.

Sponsored by:		Netflix

contrib/one-true-awk/bugs-fixed/missing-precision.ok

@@ -1,2 +0,0 @@
-../a.out: not enough args in printf(%*s)
- source line number 1

contrib/one-true-awk/bugs-fixed/negative-nf.ok

@@ -1,2 +0,0 @@
-../a.out: cannot set NF to a negative value
- source line number 1

contrib/one-true-awk/bugs-fixed/pfile-overflow.ok

@@ -1,4 +0,0 @@
-../a.out: syntax error at source line 1 source file pfile-overflow.awk
- context is
-	 >>>  <<< 
-../a.out: bailing out at source line 1 source file pfile-overflow.awk

contrib/one-true-awk/bugs-fixed/system-status.awk

@@ -1,19 +0,0 @@
-# Unmodified nawk prints the 16 bit exit status divided by 256, but
-# does so using floating point arithmetic, yielding strange results.
-#
-# The fix is to use the various macros defined for wait(2) and to
-# use the signal number + 256 for death by signal, or signal number + 512
-# for death by signal with core dump.
-
-BEGIN {
-	status = system("exit 42")
-	print "normal status", status
-
-	status = system("kill -HUP $$")
-	print "death by signal status", status
-
-	status = system("kill -ABRT $$")
-	print "death by signal with core dump status", status
-
-	system("rm -f core*")
-}

contrib/one-true-awk/bugs-fixed/system-status.bad

@@ -1,3 +0,0 @@
-normal status 42
-death by signal status 0.00390625
-death by signal with core dump status 0.523438

contrib/one-true-awk/bugs-fixed/system-status.ok

@@ -1,3 +0,0 @@
-normal status 42
-death by signal status 257
-death by signal with core dump status 518

contrib/one-true-awk/bugs-fixed/system-status.ok2

@@ -1,3 +0,0 @@
-normal status 42
-death by signal status 257
-death by signal with core dump status 262

usr.bin/awk/tests/bugs-fixed/bug_fix_test.sh

@@ -25,6 +25,7 @@
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #
 
+export LANG=C.UTF-8
 SRCDIR=$(atf_get_srcdir)
 
 check()