Clang-Format: Allow empty functions to be single-line

For example

```
OIIOOutputDriver::~OIIOOutputDriver()
{
}
```

becomes

```
OIIOOutputDriver::~OIIOOutputDriver() {}
```

Saves quite some vertical space, which is especially handy for
constructors.

Pull Request: https://projects.blender.org/blender/blender/pulls/105594

intern/memutil/MEM_Allocator.h

@@ -23,20 +23,12 @@ template<typename _Tp> struct MEM_Allocator {
     typedef MEM_Allocator<_Tp1> other;
   };
 
-  MEM_Allocator() throw()
-  {
-  }
-  MEM_Allocator(const MEM_Allocator &) throw()
-  {
-  }
+  MEM_Allocator() throw() {}
+  MEM_Allocator(const MEM_Allocator &) throw() {}
 
-  template<typename _Tp1> MEM_Allocator(const MEM_Allocator<_Tp1>) throw()
-  {
-  }
+  template<typename _Tp1> MEM_Allocator(const MEM_Allocator<_Tp1>) throw() {}
 
-  ~MEM_Allocator() throw()
-  {
-  }
+  ~MEM_Allocator() throw() {}
 
   pointer address(reference __x) const
   {

intern/memutil/MEM_RefCounted.h

@@ -27,9 +27,7 @@ class MEM_RefCounted {
   /**
    * Constructs a shared object.
    */
-  MEM_RefCounted() : m_refCount(1)
-  {
-  }
+  MEM_RefCounted() : m_refCount(1) {}
 
   /**
    * Returns the reference count of this object.
@@ -55,9 +53,7 @@ class MEM_RefCounted {
    * Destructs a shared object.
    * The destructor is protected to force the use of incRef and decRef.
    */
-  virtual ~MEM_RefCounted()
-  {
-  }
+  virtual ~MEM_RefCounted() {}
 
  protected:
   /** The reference count. */