code: drawterm

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fix drawterm compiles using gcc 10

-fno-common became the default, and and kmesg was relying
on common symbols being merged.

--- a/kern/dat.h

+++ b/kern/dat.h

@@ -32,6 +32,7 @@

 typedef struct RWlock	RWlock;

 typedef struct Waitq	Waitq;

 typedef struct Walkqid	Walkqid;

+typedef struct Kmesg	Kmesg;

 typedef int    Devgen(Chan*, char*, Dirtab*, int, int, Dir*);

 #include "fcall.h"

@@ -477,8 +478,10 @@

  * Log console output so it can be retrieved via /dev/kmesg.

  * This is good for catching boot-time messages after the fact.

  */

-struct {

+struct Kmesg {

 	Lock lk;

 	uint n;

 	char buf[16384];

-} kmesg;

+};

+

+extern Kmesg kmesg;

--- a/kern/devcons.c

+++ b/kern/devcons.c

@@ -13,6 +13,7 @@

 void	(*screenputs)(char*, int) = 0;

+Kmesg	kmesg;			/* console messages */

 Queue*	kbdq;			/* unprocessed console input */

 Queue*	lineq;			/* processed console input */

 Queue*	kprintoq;		/* console output, for /dev/kprint */