Dev (#376)

Errno updates with errno for linux/win/macos. Updated $$ syntax to also match compiler constants.

test/test_suite/compile_time/ct_if_fails.c3

@@ -1,31 +1,28 @@
-$if 3: // #error: Expected '('
-$endif;
-
 int x;
-$if (x > 0):
+$if x > 0:
 $endif;
 
-$if (0):
+$if 0:
     $assert(false);
 $endif;
 
-$if (1):
+$if 1:
 $else:
 $endif;
 
-$if (1):
+$if 1:
 $else:
 $else: // #error: Expected a top level declaration here.
 $endif;
 
 
-$if (1):
-$elif (2):
+$if 1:
+$elif 2:
 $else:
 $endif;
 
-$if (1):
-$elif (2):
-$elif (3):
+$if 1:
+$elif 2:
+$elif 3:
 $else:
 $endif;