Fix nimble build for 1.6 (#21490)

lib/compilation.nim

@@ -0,0 +1,15 @@
+const
+  NimMajor* {.intdefine.}: int = 1
+    ## is the major number of Nim's version. Example:
+    ##
+    ## .. code-block:: Nim
+    ##   when (NimMajor, NimMinor, NimPatch) >= (1, 3, 1): discard
+    # see also std/private/since
+
+  NimMinor* {.intdefine.}: int = 6
+    ## is the minor number of Nim's version.
+    ## Odd for devel, even for releases.
+
+  NimPatch* {.intdefine.}: int = 11
+    ## is the patch number of Nim's version.
+    ## Odd for devel, even for releases.

lib/system.nim

@@ -2116,21 +2116,7 @@ template unlikely*(val: bool): bool =
     else:
       unlikelyProc(val)
 
-const
-  NimMajor* {.intdefine.}: int = 1
-    ## is the major number of Nim's version. Example:
-    ##
-    ## .. code-block:: Nim
-    ##   when (NimMajor, NimMinor, NimPatch) >= (1, 3, 1): discard
-    # see also std/private/since
-
-  NimMinor* {.intdefine.}: int = 6
-    ## is the minor number of Nim's version.
-    ## Odd for devel, even for releases.
-
-  NimPatch* {.intdefine.}: int = 11
-    ## is the patch number of Nim's version.
-    ## Odd for devel, even for releases.
+include compilation
 
 import system/dollars
 export dollars

nim.nimble

@@ -1,4 +1,4 @@
-include "lib/system/compilation.nim"
+include "lib/compilation.nim"
 version = $NimMajor & "." & $NimMinor & "." & $NimPatch
 author = "Andreas Rumpf"
 description = "Compiler package providing the compiler sources as a library."