Add threadwrap to conio.h, fix typo

Hopefully nothing still builds conio as single-threaded anymore.

src/conio/bitmap_con.c

@@ -877,7 +877,7 @@ bitmap_vmem_puttext(int sx, int sy, int ex, int ey, struct vmem_cell *fill)
 
 	pthread_mutex_lock(&vstatlock);
 	ret = bitmap_vmem_puttext_locked(sx, sy, ex, ey, fill);
-	pthread_mutex_lock(&vstatlock);
+	pthread_mutex_unlock(&vstatlock);
 	return ret;
 }
 

src/conio/ciolib.h

@@ -38,6 +38,7 @@
 #if defined(__DARWIN__)
 #include <semwrap.h>
 #endif
+#include "threadwrap.h"
 #include "gen_defs.h"
 #include "utf8_codepages.h"