Fix MSEND so it can initialize and dump out itself.

Make use of IMSOC1 and IMPSTL assembly-time conditional.  They are
only used to send to "NET".

src/sysen2/msend.141

@@ -17,6 +17,8 @@ TITLE MSEND
 ; TTY input is handled by a (crockish) insrt file, which see.
 
 
+IFNDEF NETP, NETP==0
+
 O=0
 A=1
 B=2
@@ -802,6 +804,7 @@ NETSNL:	SOJGE	T,NETSNB
 
 ; COME HERE TO SEE IF STY (STYSTS IN A) IS OWNED BY SOMEONE WITH NET SOCKETS
 NETQ:	HRRZS	A
+IFN NETP,[
 	PUSH	P,T
 	PUSH	P,B
 	MOVE	T,IMPSTL		; # SOCKETS
@@ -815,6 +818,7 @@ NETQL:	SKIPL	B,@IMSOC1
 NETQLE:	SOJGE	T,NETQL
 NETQO:	POP	P,B
 	POP	P,T
+]; NETP
 	POPJ	P,
 
 ; SEND TO ALL USERS
@@ -1218,8 +1222,10 @@ TTYSTS:	0
 TTYTYP:	0
 	SQUOZE	0,STYSTS
 STYSTS:	0
+IFN NETP,[
 	SQUOZE	0,IMSOC1
 IMSOC1:	0
+]
 TTYVAR:	TTYBLK-.,,TTYBLK
 CONBLK:
 	SQUOZE	0,L
@@ -1230,8 +1236,10 @@ NCT:	0
 NFSTTY:	0
 	SQUOZE	0,NSTTYS
 NSTTYS:	0
+IFN NETP,[
 	SQUOZE	0,IMPSTL
 IMPSTL:	0
+]
 SYSCON:	CONBLK-.,,CONBLK
 LOCBLK:	
 	SQUOZE	0,USRHI