Implement {.booldefine.} (#10533)

tests/misc/tdefine.nim

@@ -0,0 +1,18 @@
+discard """
+joinable: false
+cmd: "nim c -d:booldef -d:booldef2=false -d:intdef=2 -d:strdef=foobar -r $file"
+"""
+
+const booldef {.booldefine.} = false
+const booldef2 {.booldefine.} = true
+const intdef {.intdefine.} = 0
+const strdef {.strdefine.} = ""
+
+doAssert defined(booldef)
+doAssert defined(booldef2)
+doAssert defined(intdef)
+doAssert defined(strdef)
+doAssert booldef
+doAssert not booldef2
+doAssert intdef == 2
+doAssert strdef == "foobar"