all: remove $OBJTYPE from build

Now that we assume pthreads, the only assembly
left is in libmp and libsec.
We only ever added assembly for 386.
The portable C code is fine for plan9port.

bin/9c

@@ -112,24 +112,14 @@ usexlc()
 	cflags="$cflags $CC9FLAGS"
 }
 
-tag="${SYSNAME:-`uname`}-${OBJTYPE:-`uname -m`}-${CC9:-cc}"
+tag="${SYSNAME:-`uname`}-${CC9:-cc}"
 case "$tag" in
 *DragonFly*gcc*|*BSD*gcc*)	usegcc ;;
 *DragonFly*clang|*BSD*clang*)	useclang ;;
-*Darwin-x86_64*)
+*Darwin*)
 		useclang
 		cflags="$cflags -g3 -m64"
 		;;
-*Darwin-arm64*)
-		useclang
-		cflags="$cflags -g3 -m64"
-		;;
-*Darwin*clang*)
-		useclang
-		cflags="$cflags -g3 -m32"
-		;;
-*Darwin*)	usegcc
-		cflags="$cflags -g3 -no-cpp-precomp -m32" ;;
 *HP-UX*)	cc=${CC9:-cc}; cflags="-g -O -c -Ae" ;;
 *Linux*)	usegcc
 		case "${CC9:-gcc}" in