included errno.h instead of declaring _oserrno as external

git-svn-id: svn://svn.cc65.org/cc65/trunk@940 b7a2c559-68d2-44c3-8de9-860c34a00d81

libsrc/cbm/cbm_load.c

@@ -5,8 +5,7 @@
  */
 
 #include <cbm.h>
-
+#include <errno.h>
-extern unsigned char _oserror;         
 
 /* loads file "name" from given device to given address or to the load address
  * of the file if addr is 0

libsrc/cbm/cbm_open.c

@@ -6,8 +6,7 @@
  */
  
 #include <cbm.h>
-
+#include <errno.h>
-extern unsigned char _oserror;
 
 /* It's like BASIC's: OPEN lfn, device, sec_addr, "name"
  */

libsrc/cbm/cbm_read.c

@@ -5,8 +5,7 @@
  */
 
 #include <cbm.h>
-
+#include <errno.h>
-extern unsigned char _oserror;
 
 int cbm_read(unsigned char lfn, void* buffer, unsigned int size)
 {

libsrc/cbm/cbm_save.c

@@ -8,8 +8,7 @@
  */
 
 #include <cbm.h>
-
+#include <errno.h>
-extern unsigned char _oserror;
 
 /* saves a memory area from start to end-1 to a file.
  */

libsrc/cbm/cbm_write.c

@@ -5,8 +5,7 @@
  */
 
 #include <cbm.h>
-
+#include <errno.h>
-extern unsigned char _oserror;
 
 int cbm_write(unsigned char lfn, void* buffer, unsigned int size) {