Fix -DBUILD_WITH_STRICT_TMPPATH dtrace builds

Some of the scripts used for libdtrace invoke nawk instead of awk
(for example cddl/contrib/opensolaris/lib/libdtrace/common/mknames.sh).
When bootstrapping all tools, we get the nawk -> awk link while building
usr.bin/awk, but when linking/copying the dependencies from the host we
were only adding awk but not nawk.

This was silently generating invalid files when building libdtrace with
BUILD_WITH_STRICT_TMPPATH=1 since those scripts invoke nawk instead of
awk. In addition to adding the missing link this commit also adds
set -e to those scripts to catch errors like this in the future.

Reviewed By:	markj, emaste
Differential Revision: https://reviews.freebsd.org/D26025

Makefile.inc1

@@ -2240,9 +2240,13 @@ ${_bt}-usr.bin/mandoc: ${_bt}-lib/libopenbsd
 _basic_bootstrap_tools_multilink=usr.bin/grep grep,egrep,fgrep
 _basic_bootstrap_tools_multilink+=bin/test test,[
 # bootstrap tools needed by buildworld:
-_basic_bootstrap_tools=usr.bin/awk usr.bin/cut bin/expr usr.bin/gencat \
+_basic_bootstrap_tools=usr.bin/cut bin/expr usr.bin/gencat \
     usr.bin/join usr.bin/mktemp bin/rmdir usr.bin/sed usr.bin/sort \
     usr.bin/truncate usr.bin/tsort
+# Some build scripts use nawk instead of awk (this happens at least in
+# cddl/contrib/opensolaris/lib/libdtrace/common/mknames.sh) so we need both awk
+# and nawk in ${WORLDTMP}/legacy/bin.
+_basic_bootstrap_tools_multilink+=usr.bin/awk awk,nawk
 # file2c is required for building usr.sbin/config:
 _basic_bootstrap_tools+=usr.bin/file2c
 # uuencode/uudecode required for share/tabset

cddl/contrib/opensolaris/lib/libdtrace/common/mkerrno.sh

@@ -25,6 +25,7 @@
 # Use is subject to license terms.
 #
 #ident	"%Z%%M%	%I%	%E% SMI"
+set -e
 
 echo "\
 /*\n\

cddl/contrib/opensolaris/lib/libdtrace/common/mkerrtags.sh

@@ -25,6 +25,7 @@
 # Use is subject to license terms.
 #
 #ident	"%Z%%M%	%I%	%E% SMI"
+set -e
 
 BSDECHO=-e
 

cddl/contrib/opensolaris/lib/libdtrace/common/mknames.sh

@@ -25,6 +25,7 @@
 # Use is subject to license terms.
 #
 #ident	"%Z%%M%	%I%	%E% SMI"
+set -e
 
 BSDECHO=-e
 

cddl/contrib/opensolaris/lib/libdtrace/common/mksignal.sh

@@ -25,6 +25,7 @@
 # Use is subject to license terms.
 #
 #ident	"%Z%%M%	%I%	%E% SMI"
+set -e
 
 echo "\
 /*\n\