use lowercase --define switches (#17283)

tests/manyloc/keineschweine/dependencies/enet/enet.nim

@@ -265,7 +265,7 @@ const
   ENET_PEER_RELIABLE_WINDOW_SIZE         = 0x1000
   ENET_PEER_FREE_RELIABLE_WINDOWS        = 8
 
-when defined(Linux) or true:
+when defined(linux) or true:
   import posix
   const
     ENET_SOCKET_NULL*: cint = -1
@@ -295,7 +295,7 @@ when defined(Linux) or true:
   template ENET_SOCKETSET_CHECK*(sockset, socket: untyped): untyped =
     FD_ISSET(socket, addr((sockset)))
 
-when defined(Windows):
+when defined(windows):
   ## put the content of win32.h in here
 
 

tests/manyloc/keineschweine/lib/glut.nim

@@ -93,7 +93,7 @@ const
   GLUT_NORMAL* = 0
   GLUT_OVERLAY* = 1
 
-when defined(Windows):
+when defined(windows):
   const                       # Stroke font constants (use these in GLUT program).
     GLUT_STROKE_ROMAN* = cast[Pointer](0)
     GLUT_STROKE_MONO_ROMAN* = cast[Pointer](1) # Bitmap font constants (use these in GLUT program).

tests/niminaction/Chapter8/sdl/sdl.nim

@@ -1,8 +1,8 @@
-when defined(Windows):
+when defined(windows):
   const libName* = "SDL2.dll"
-elif defined(Linux) or defined(freebsd) or defined(netbsd):
+elif defined(linux) or defined(freebsd) or defined(netbsd):
   const libName* = "libSDL2.so"
-elif defined(MacOsX):
+elif defined(macosx):
   const libName* = "libSDL2.dylib"
 elif defined(openbsd):
   const libName* = "libSDL2.so.0.6"

tests/stdlib/tos.nim

@@ -353,7 +353,7 @@ block absolutePath:
   doAssertRaises(ValueError): discard absolutePath("a", "b")
   doAssert absolutePath("a") == getCurrentDir() / "a"
   doAssert absolutePath("a", "/b") == "/b" / "a"
-  when defined(Posix):
+  when defined(posix):
     doAssert absolutePath("a", "/b/") == "/b" / "a"
     doAssert absolutePath("a", "/b/c") == "/b/c" / "a"
     doAssert absolutePath("/a", "b/") == "/a"
@@ -610,7 +610,7 @@ block: # normalizePathEnd
     doAssert "//".normalizePathEnd(false) == "/"
     doAssert "foo.bar//".normalizePathEnd == "foo.bar"
     doAssert "bar//".normalizePathEnd(trailingSep = true) == "bar/"
-  when defined(Windows):
+  when defined(windows):
     doAssert r"C:\foo\\".normalizePathEnd == r"C:\foo"
     doAssert r"C:\foo".normalizePathEnd(trailingSep = true) == r"C:\foo\"
     # this one is controversial: we could argue for returning `D:\` instead,

tests/stdlib/tosprocterminate.nim

@@ -6,7 +6,7 @@ discard """
 
 import os, osproc, times, std / monotimes
 
-when defined(Windows):
+when defined(windows):
   const ProgramWhichDoesNotEnd = "notepad"
 elif defined(openbsd):
   const ProgramWhichDoesNotEnd = "/bin/cat"

tests/template/tmodulealias.nim

@@ -7,7 +7,7 @@ when defined(windows):
 else:
   import posix
 
-when defined(Windows):
+when defined(windows):
   template orig: expr =
     winlean
 else: