Improve #include guard macros

Avoid using reserved identifiers such as `_DOHINT_H` (fixes #1989),
fix cases where the name doesn't match the filename, and make the naming
more consistent and less likely to collide with include guards in other
headers.

Examples/javascript/nspace/example.h

@@ -1,5 +1,5 @@
-#ifndef _example_guardian_
-#define _example_guardian_
+#ifndef EXAMPLE_H
+#define EXAMPLE_H
 
 int module_function() { return 7; }
 int module_variable = 9;

Examples/lua/nspace/example.h

@@ -1,5 +1,5 @@
-#ifndef _example_guardian_
-#define _example_guardian_
+#ifndef EXAMPLE_H
+#define EXAMPLE_H
 
 int module_function() { return 7; }
 int module_variable = 9;

Examples/ruby/free_function/example.h

@@ -1,5 +1,5 @@
-#ifndef _EXAMPLE_H_
-#define _EXAMPLE_H_
+#ifndef EXAMPLE_H
+#define EXAMPLE_H
 
 #include <vector>
 #include <string>
@@ -46,4 +46,4 @@ public:
 	Animal* get_animal(size_t i) const;
 };
 
-#endif /*_EXAMPLE_H_*/
+#endif /* EXAMPLE_H */

Examples/ruby/mark_function/example.h

@@ -1,5 +1,5 @@
-#ifndef _EXAMPLE_H_
-#define _EXAMPLE_H_
+#ifndef EXAMPLE_H
+#define EXAMPLE_H
 
 #include <vector>
 #include <string>
@@ -46,4 +46,4 @@ public:
 	Animal* get_animal(size_t i) const;
 };
 
-#endif /*_EXAMPLE_H_*/
+#endif /* EXAMPLE_H */

Examples/test-suite/refcount.h

@@ -1,5 +1,5 @@
-#ifndef TEST_SUITE_REFCOUNT_H__
-#define TEST_SUITE_REFCOUNT_H__
+#ifndef TEST_SUITE_REFCOUNT_H
+#define TEST_SUITE_REFCOUNT_H
 
 struct RCObjBase  {
   /*!
@@ -195,4 +195,4 @@ RCPtr<T>& RCPtr<T>::operator=(const RCPtr& rhs)
 
 
 
-#endif //TEST_SUITE_REFCOUNT_H__
+#endif // TEST_SUITE_REFCOUNT_H

Examples/test-suite/template_typedef_cplx2.h

@@ -1,5 +1,5 @@
-#ifndef ___typedef_import_h__
-#define ___typedef_import_h__
+#ifndef TEMPLATE_TYPEDEF_CPLX2_H
+#define TEMPLATE_TYPEDEF_CPLX2_H
 
 #ifdef SWIG
 %module template_typedef_cplx2;
@@ -174,4 +174,4 @@ namespace vfncs {
 
 #endif
 
-#endif //___template_typedef_h__
+#endif // TEMPLATE_TYPEDEF_CPLX2_H