move linker options testing into a separate test

only tests on linux, but that should provide at least some coverage

tests/vm/tcompilesetting.nim

@@ -1,5 +1,5 @@
 discard """
-matrix: "--nimcache:build/myNimCache --nimblePath:myNimblePath --passc:'-fmax-errors=4' --passl:'-Xlinker --defsym -Xlinker dummysymboldoesnotexist=0x0'"
+matrix: "--nimcache:build/myNimCache --nimblePath:myNimblePath --passc:'-fmax-errors=4'"
 joinable: false
 """
 
@@ -13,8 +13,6 @@ template main =
   doAssert querySetting(backend) == "c"
   doAssert fileExists(libPath.querySetting / "system.nim")
   doAssert "-fmax-errors=4" in querySetting(compileOptions)
-  doAssert "-Xlinker --defsym -Xlinker dummysymboldoesnotexist=0x0" in
-              querySetting(linkOptions)
 
 static: main()
 main()

tests/vm/tcompilesettings_passl.nim

@@ -0,0 +1,20 @@
+discard """
+  description: "Test for `std/compilesettings` querying of linker options"
+  matrix: "--passl:'-Xlinker --defsym -Xlinker dummysymboldoesnotexist=0x0'"
+  joinable: false
+  disabled: windows
+  disabled: osx
+"""
+
+# finding a "no-op" like cross-platform linker option turned out to be a pain,
+# so doing some basic testing on linux at least.
+
+import std/[strutils, compilesettings]
+from std/os import fileExists, `/`
+
+template main =
+  doAssert "-Xlinker --defsym -Xlinker dummysymboldoesnotexist=0x0" in
+              querySetting(linkOptions)
+
+static: main()
+main()