Revert "make system/fatal importable (#20718)"

This reverts commit d735c44.

lib/std/assertions.nim

@@ -9,7 +9,8 @@
 
 ## This module implements assertion handling.
 
-import system/fatal
+when not declared(sysFatal):
+  include "system/fatal"
 
 import std/private/miscdollars
 # ---------------------------------------------------------------------------

lib/system.nim

@@ -1637,13 +1637,8 @@ when not defined(nimscript):
     ## for debug builds. Since it's usually used for debugging, this
     ## is proclaimed to have no IO effect!
 
-
-when defined(nimHasExceptionsQuery):
-  const gotoBasedExceptions = compileOption("exceptions", "goto")
-else:
-  const gotoBasedExceptions = false
-
-import system/fatal
+when not declared(sysFatal):
+  include "system/fatal"
 
 when not defined(nimscript):
   {.push stackTrace: off, profiler: off.}

lib/system/fatal.nim

@@ -9,22 +9,27 @@
 
 {.push profiler: off.}
 
+when defined(nimHasExceptionsQuery):
+  const gotoBasedExceptions = compileOption("exceptions", "goto")
+else:
+  const gotoBasedExceptions = false
+
 when hostOS == "standalone":
   include "$projectpath/panicoverride"
 
-  func sysFatal*(exceptn: typedesc, message: string) {.inline.} =
+  func sysFatal(exceptn: typedesc, message: string) {.inline.} =
     panic(message)
 
-  func sysFatal*(exceptn: typedesc, message, arg: string) {.inline.} =
+  func sysFatal(exceptn: typedesc, message, arg: string) {.inline.} =
     rawoutput(message)
     panic(arg)
 
 elif (defined(nimQuirky) or defined(nimPanics)) and not defined(nimscript):
-  import system/ansi_c
+  import ansi_c
 
   func name(t: typedesc): string {.magic: "TypeTrait".}
 
-  func sysFatal*(exceptn: typedesc, message, arg: string) {.inline, noreturn.} =
+  func sysFatal(exceptn: typedesc, message, arg: string) {.inline, noreturn.} =
     when nimvm:
       # TODO when doAssertRaises works in CT, add a test for it
       raise (ref exceptn)(msg: message & arg)
@@ -41,14 +46,14 @@ elif (defined(nimQuirky) or defined(nimPanics)) and not defined(nimscript):
         cstderr.rawWrite buf
       quit 1
 
-  func sysFatal*(exceptn: typedesc, message: string) {.inline, noreturn.} =
+  func sysFatal(exceptn: typedesc, message: string) {.inline, noreturn.} =
     sysFatal(exceptn, message, "")
 
 else:
-  func sysFatal*(exceptn: typedesc, message: string) {.inline, noreturn.} =
+  func sysFatal(exceptn: typedesc, message: string) {.inline, noreturn.} =
     raise (ref exceptn)(msg: message)
 
-  func sysFatal*(exceptn: typedesc, message, arg: string) {.inline, noreturn.} =
+  func sysFatal(exceptn: typedesc, message, arg: string) {.inline, noreturn.} =
     raise (ref exceptn)(msg: message & arg)
 
 {.pop.}