Revert "Fixes #12187 (#12321)" (#12447)

This reverts commit 00c31e8766.

lib/pure/concurrency/cpuinfo.nim

@@ -79,7 +79,7 @@ proc countProcessors*(): int {.rtl, extern: "ncpi$1".} =
       len: csize
     mib[0] = CTL_HW
     mib[1] = HW_AVAILCPU
-    len = csize sizeof(numCPU)
+    len = sizeof(numCPU)
     discard sysctl(addr(mib), 2, addr(numCPU), len, nil, 0)
     if numCPU < 1:
       mib[1] = HW_NCPU

lib/pure/memfiles.nim

@@ -416,7 +416,7 @@ iterator memSlices*(mfile: MemFile, delim = '\l', eat = '\r'): MemSlice {.inline
   ms.data = mfile.mem
   var remaining = mfile.size
   while remaining > 0:
-    ending = c_memchr(ms.data, delim, csize remaining)
+    ending = c_memchr(ms.data, delim, remaining)
     if ending == nil: # unterminated final slice
       ms.size = remaining # Weird case..check eat?
       yield ms

lib/pure/strutils.nim

@@ -1872,7 +1872,7 @@ proc find*(s: string, sub: char, start: Natural = 0, last = 0): int {.noSideEffe
     when hasCStringBuiltin:
       let L = last-start+1
       if L > 0:
-        let found = c_memchr(s[start].unsafeAddr, sub, csize L)
+        let found = c_memchr(s[start].unsafeAddr, sub, L)
         if not found.isNil:
           return cast[ByteAddress](found) -% cast[ByteAddress](s.cstring)
     else: