Remove ZGMTIME test

This test used a simple busy loop to wait for one second. The test in
this loop is optimized out on newest compilers, resulting in an
endless loop. Also, on i386 this test sometimes failes because there
were no CPU tics added duting the busy loop.

test/os.md

@@ -1,83 +1,5 @@
 # OS specific function is host$os
 
-## ZGTIME
-
-ZGTIME returns a local clock  time in seconds and the
-used cpu time in milliseconds.
-
-File: `timetest.x`
-```
-task timetest = t_timetest
-procedure t_timetest ()
-long clktime0, cputime0
-long clktime1, cputime1
-int errs
-begin
-    call zgtime(clktime0, cputime0)
-    if (clktime0 < 1280000000) {
-        call printf("Unreasonable clktime %d (cputime is %d)\n")
-            call pargl(clktime0)
-            call pargl(cputime0)
-	return
-    }
-    clktime1 = clktime0
-    cputime1 = cputime0
-    errs = 0
-    # Busy loop until wall clock increases by one second
-    while (clktime1 == clktime0) {
-        call zgtime(clktime1, cputime1)
-    }
-    if (clktime1 < clktime0) {
-        call printf("ERROR: Backward clktime %d --> %d\n")
-            call pargl(clktime0)
-            call pargl(clktime1)
-	errs = errs + 1
-    }
-    if (clktime1 > clktime0 + 2) {
-        call printf("ERROR: Clktime is too fast %d --> %d\n")
-            call pargl(clktime0)
-            call pargl(clktime1)
-	errs = errs + 1
-    }
-    if (clktime1 > clktime0 + 2) {
-        call printf("ERROR: Clktime is too fast %d --> %d\n")
-            call pargl(clktime0)
-            call pargl(clktime1)
-	errs = errs + 1
-    }
-    if (cputime1 < cputime0) {
-        call printf("ERROR: Backward cputime %d --> %d\n")
-            call pargl(cputime0)
-            call pargl(cputime1)
-	errs = errs + 1
-    }
-    if (cputime1 == cputime0) {
-        call printf("ERROR: Constant cputime %d --> %d\n")
-            call pargl(cputime0)
-            call pargl(cputime1)
-	errs = errs + 1
-    }
-    if (cputime1 > cputime0 + 1000 * (clktime1 - clktime0)) {
-        call printf("ERROR: Cputime faster that clktime: %d --> %d\n")
-            call pargl(cputime0)
-            call pargl(cputime1)
-	errs = errs + 1
-    }
-    call printf("%d errors\n")
-        call pargi(errs)
-end
-```
-
-The test program should just return zero errors:
-
-```
-cl> softools
-cl> xc -w timetest.x
-cl> task $timetest = timetest.e
-cl> timetest
-0 errors
-```
-
 ## ZGMTCO
 
 ZGMTCO returns the correction, in seconds, from local standard