Added _systime for all platforms

git-svn-id: svn://svn.cc65.org/cc65/trunk@1510 b7a2c559-68d2-44c3-8de9-860c34a00d81

libsrc/atari/systime.s

@@ -0,0 +1,28 @@
+;
+; Ullrich von Bassewitz, 12.11.2002
+;
+; 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
+;  */
+;
+
+	.export		__systime
+
+        .importzp       sreg
+
+.code
+
+.proc   __systime
+
+        lda     #$FF
+        tax
+        sta     sreg
+        sta     sreg+1
+        rts                     ; Return -1
+
+.endproc
+
+