Changed multi-line C comments into another style.

The left side doesn't look unbalanced.

libsrc/atari/exetrailer.s

@@ -1,7 +1,7 @@
 ; This file defines the EXE file "trailer" which sets the entry point
 
         .export         __AUTOSTART__: absolute = 1
-	.import         start
+        .import         start
 
         .include        "atari.inc"
 

libsrc/atari/system_check.s

@@ -194,7 +194,7 @@ delay1: ldx     #0
 end:
 
 .ifndef __ATARIXL__
-tmp:		; outside of the load chunk, some kind of poor man's .bss
+tmp:            ; outside of the load chunk, some kind of poor man's .bss
 .endif
 
 ; ------------------------------------------------------------------------

libsrc/atari/systime.s

@@ -3,10 +3,10 @@
 ;
 ; time_t _systime (void);
 ; /* Similar to time(), but:
-;  *   - Is not ISO C
-;  *   - Does not take the additional pointer
-;  *   - Does not set errno when returning -1
-;  */
+; **   - Is not ISO C
+; **   - Does not take the additional pointer
+; **   - Does not set errno when returning -1
+; */
 ;
 
         .export         __systime

libsrc/atari/targetutil/w2cas.c

@@ -1,12 +1,12 @@
 /* w2cas.c -- write file to cassette
- *
- * This program writes a boot file (typically linked with
- * 'atari-cassette.cfg') to the cassette.
- * Only files < 32K are supported, since the loading of
- * larger files requires a special loader inside the program.
- *
- * Christian Groessler, chris@groessler.org, 2014
- */
+**
+** This program writes a boot file (typically linked with
+** 'atari-cassette.cfg') to the cassette.
+** Only files < 32K are supported, since the loading of
+** larger files requires a special loader inside the program.
+**
+** Christian Groessler, chris@groessler.org, 2014
+*/
 
 #include <stdio.h>
 #include <stdlib.h>