Makefile: toplevel 'make techs' target to process scmos during build

Previously it would only build the 'scmos' subdir when the
'make install' target is running, which is done sudo.  This
would result in a number of files in scmos/cif_template/objs
to be owned by 'root'.

Renamed TECH to TECHS which is inline with the other caregories
MODULES and LIBS.

Makefile

@@ -4,7 +4,7 @@
 
 MAGICDIR   = .
 PROGRAMS   = magic
-TECH       = scmos
+TECHS      = scmos
 LIBRARIES  = database utils extflat
 MODULES    = bplane cmwind commands database dbwind debug drc extflat \
 	     extract graphics netmenu plow resis select sim textio tiles \
@@ -14,11 +14,11 @@ MODULES    = bplane cmwind commands database dbwind debug drc extflat \
 VERSION    := $(shell cat ${MAGICDIR}/VERSION)
 
 MAKEFLAGS  =
-INSTALL_CAD_DIRS = windows doc ${TECH}
+INSTALL_CAD_DIRS = windows doc ${TECHS}
 
 -include defs.mak
 
-all:	$(ALL_TARGET)
+all:	$(ALL_TARGET) techs
 
 standard:
 	@echo --- errors and warnings logged in file make.log
@@ -81,6 +81,12 @@ $(addsuffix /Depend, ${SUBDIRS_FILTERED}): database/database.h
 .PHONY: depend
 depend: defs.mak $(addsuffix /Depend, ${SUBDIRS_FILTERED})
 
+.PHONY: techs
+techs: depend
+	@echo --- making techs
+	for dir in ${TECHS}; do \
+		(cd $$dir && ${MAKE} all) || exit 1; done
+
 install: $(INSTALL_TARGET)
 
 install-magic: