fix errno related underscores in all libsrc/*.s files

libsrc/geos-common/disk/calcblksfree.s

@@ -5,7 +5,7 @@
 
 ; int CalcBlksFree (void);
 
-            .import __oserror
+            .import ___oserror
             .export _CalcBlksFree
 
             .include "jumptab.inc"
@@ -18,7 +18,7 @@ _CalcBlksFree:
         sta r5L
         stx r5H
         jsr CalcBlksFree
-        stx __oserror
+        stx ___oserror
         lda r4L
         ldx r4H
         rts

libsrc/geos-common/disk/getptrcurdknm.s

@@ -7,7 +7,7 @@
 ;  (fills curName[17] with current disk's name)
 
             .importzp ptr4, ptr3
-            .import __oserror
+            .import ___oserror
             .export _GetPtrCurDkNm
 
             .include "jumptab.inc"
@@ -34,5 +34,5 @@ namelp: lda (ptr4),y
         bne namelp
 fin:    lda #0
         sta (ptr3),y
-        stx __oserror
+        stx ___oserror
         rts

libsrc/geos-common/disk/setnextfree.s

@@ -5,7 +5,7 @@
 
 ; struct tr_se SetNextFree (struct tr_se *startTS);
 
-            .import __oserror
+            .import ___oserror
             .import gettrse
             .export _SetNextFree
 
@@ -18,7 +18,7 @@ _SetNextFree:
         sta r3L
         stx r3H
         jsr SetNextFree
-        stx __oserror
+        stx ___oserror
         lda r3L
         ldx r3H
         rts