Skip the UTF-8 BOM of including files.

For avoiding illegal token error when parsing include files which have the UTF-8 BOM.

Closes #75.

Examples/test-suite/bom_utf8.i

@@ -0,0 +1,9 @@
+%module bom_utf8
+
+/* Test for UTF8 BOM at start of file */
+%inline %{
+struct NotALotHere {
+  int n;
+};
+%}
+

Examples/test-suite/common.mk

@@ -552,7 +552,8 @@ C_TEST_CASES += \
 	typedef_struct \
 	typemap_subst \
 	union_parameter \
-	unions
+	unions \
+	utf8_bom
 
 
 # Multi-module C++ test cases . (Can be run individually using make testcase.multicpptest)