On-device build support.

diff -uNr dash-0.5.10.2/src/mktokens dash-0.5.10.2.mod/src/mktokens
--- dash-0.5.10.2/src/mktokens	2014-09-28 11:19:32.000000000 +0300
+++ dash-0.5.10.2.mod/src/mktokens	2019-08-16 03:05:06.422193420 +0300
@@ -37,7 +37,7 @@
 # token marks the end of a list.  The third column is the name to print in
 # error messages.
 
-cat > /tmp/ka$$ <<\!
+cat > ${TMPDIR:-/tmp}/ka$$ <<\!
 TEOF	1	end of file
 TNL	0	newline
 TSEMI	0	";"
@@ -68,28 +68,28 @@
 TBEGIN	0	"{"
 TEND	1	"}"
 !
-nl=`wc -l /tmp/ka$$`
+nl=`wc -l ${TMPDIR:-/tmp}/ka$$`
 exec > token.h
-awk '{print "#define " $1 " " NR-1}' /tmp/ka$$
+awk '{print "#define " $1 " " NR-1}' ${TMPDIR:-/tmp}/ka$$
 
 exec > token_vars.h
 
 echo '
 /* Array indicating which tokens mark the end of a list */
 static const char tokendlist[] = {'
-awk '{print "\t" $2 ","}' /tmp/ka$$
+awk '{print "\t" $2 ","}' ${TMPDIR:-/tmp}/ka$$
 echo '};
 
 static const char *const tokname[] = {'
 sed -e 's/"/\\"/g' \
     -e 's/[^	 ]*[	 ][	 ]*[^	 ]*[	 ][	 ]*\(.*\)/	"\1",/' \
-    /tmp/ka$$
+    ${TMPDIR:-/tmp}/ka$$
 echo '};
 '
-sed 's/"//g' /tmp/ka$$ | awk '
-/TNOT/{print "#define KWDOFFSET " NR-1; print ""; 
+sed 's/"//g' ${TMPDIR:-/tmp}/ka$$ | awk '
+/TNOT/{print "#define KWDOFFSET " NR-1; print "";
       print "static const char *const parsekwd[] = {"}
 /TNOT/,/neverfound/{if (last) print "	\"" last "\","; last = $3}
 END{print "	\"" last "\"\n};"}'
 
-rm /tmp/ka$$
+rm ${TMPDIR:-/tmp}/ka$$