Cleanup of Makefiles

Fixed Makefile dependenies for the args.h rule.

Fixed Makefile cases where echo with -n is used.  On some systems,
/bin/sh does not use -n, so we must call /bin/echo -n instead
via the ${ECHON} Makefile variable.

Add missing standard tools to sub-Makefiles to make them
easier to invoke directly.

Sort lists of standard tool Makefile variables and remove duplicates.

Declare the SHELL at the top of Makefiles.

Fixed the depend rule in the custom Makefile.

Makefile.ship

@@ -1085,6 +1085,7 @@ LANG= C
 LDCONFIG= ldconfig
 LN= ln
 MAKE= make
+MAKEDEPEND= makedepend
 MKDIR= mkdir
 MV= mv
 PWDCMD= pwd
@@ -1094,6 +1095,7 @@ SED= sed
 SORT= sort
 SPLINT= splint
 SPLINT_OPTS=
+STRIP= strip
 TEE= tee
 TOUCH= touch
 TRUE= true
@@ -1103,12 +1105,9 @@ XARGS= xargs
 # NOTE: On some shells, echo is a builtin that does
 #	not understand -n, so we call /bin/echo -n
 #	directly to get around such shells.
+#
 ECHON= /bin/echo -n
 
-# assume the X11 makedepend tool for the depend rule
-MAKEDEPEND= makedepend
-STRIP= strip
-
 # Extra compiling and linking flags
 #
 # EXTRA_CFLAGS are flags given to ${CC} when compiling C files
@@ -2062,6 +2061,7 @@ CSCRIPT_PASSDOWN= \
     CMP=${CMP} \
     CO=${CO} \
     CP=${CP} \
+    ECHON="${ECHON}" \
     FMT=${FMT} \
     HELPDIR="${HELPDIR}" \
     INCDIR="${INCDIR}" \
@@ -3894,19 +3894,12 @@ depend: custom/Makefile hsrc
 	${Q} ${RM} -rf skel
 	-${Q} if ${CMP} -s ${MAKE_FILE}.bak ${MAKE_FILE}; then \
 	    echo 'top level ${MAKE_FILE} was already up to date'; \
+	    echo 'restoring original ${MAKE_FILE};' \
 	    ${MV} -f ${MAKE_FILE}.bak ${MAKE_FILE}; \
 	else \
-	    ${RM} -f ${MAKE_FILE}.tmp; \
-	    ${MV} ${MAKE_FILE} ${MAKE_FILE}.tmp; \
-	    if [ -d RCS -a ! -w "${MAKE_FILE}" ]; then \
-		${CO} -l ${MAKE_FILE}; \
-	    fi ;\
-	    ${MV} ${MAKE_FILE}.tmp ${MAKE_FILE}; \
-	    if [ -d RCS ]; then \
-	    echo '********************************************************'; \
-	    echo 'new top level ${MAKE_FILE} formed -- need to check it in'; \
-	    echo '********************************************************'; \
-	    fi; \
+	    echo 'previous ${MAKE_FILE} is now ${MAKE_FILE}.bak'; \
+	    echo 'new top level ${MAKE_FILE} formed'; \
+	    echo 'try: diff -u ${MAKE_FILE}.bak ${MAKE_FILE}'; \
 	fi
 
 # generate the list of h files for lower level depend use