Remove deprecated <Ar/Ar.h> include.

* This used to get the version of Ar to build during the migration from
  Ar (v1 -> v2), which is now only ever (v2). The case mismatch was breaking
  Linux, but also since the header with the same name as the library name is
  reserved and changed over to the umbrella header for this library, including
  it was needlessly importing the whole module where it should not have been.
* Solution is just to remove this header from being included anywhere.

Sources/SdrOsl/oslParser.cpp

@@ -32,7 +32,6 @@
 #include "Tf/weakPtr.h"
 #include "Vt/types.h"
 #include "Vt/array.h"
-#include "Ar/ar.h"
 #include "Ar/asset.h"
 #include "Ar/resolvedPath.h"
 #include "Ar/resolver.h"

Sources/ThirdParty/renderman-24/plugin/rmanArgsParser/rmanArgsParser.cpp

@@ -35,7 +35,6 @@
 #include "Tf/weakPtr.h"
 #include "Vt/types.h"
 #include "Vt/array.h"
-#include "Ar/ar.h"
 #include "Ar/asset.h"
 #include "Ar/resolvedPath.h"
 #include "Ar/resolver.h"

Sources/ThirdParty/renderman-24/plugin/rmanOslParser/rmanOslParser.cpp

@@ -35,7 +35,6 @@
 #include "Tf/weakPtr.h"
 #include "Vt/types.h"
 #include "Vt/array.h"
-#include "Ar/ar.h"
 #include "Ar/asset.h"
 #include "Ar/resolvedPath.h"
 #include "Ar/resolver.h"

Sources/ThirdParty/renderman-25/plugin/rmanArgsParser/rmanArgsParser.cpp

@@ -35,7 +35,6 @@
 #include "Tf/weakPtr.h"
 #include "Vt/types.h"
 #include "Vt/array.h"
-#include "Ar/ar.h"
 #include "Ar/asset.h"
 #include "Ar/resolvedPath.h"
 #include "Ar/resolver.h"

Sources/ThirdParty/renderman-25/plugin/rmanOslParser/rmanOslParser.cpp

@@ -35,7 +35,6 @@
 #include "Tf/weakPtr.h"
 #include "Vt/types.h"
 #include "Vt/array.h"
-#include "Ar/ar.h"
 #include "Ar/asset.h"
 #include "Ar/resolvedPath.h"
 #include "Ar/resolver.h"