style fix: add @SuppressWarnings("truffle-abstract-export")

Author: cosminbasca

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/modules/cext/PythonCextBuiltins.java

@@ -1769,6 +1769,7 @@ private static PythonManagedClass lookupBuiltinTypeWithName(PythonContext contex
      * used like a {@code char*} pointer.
      */
     @ExportLibrary(InteropLibrary.class)
+    @SuppressWarnings("truffle-abstract-export")
     public static final class PMMapWrapper implements TruffleObject {
 
         private final PMMap delegate;

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/objects/cext/common/CArrayWrappers.java

@@ -243,6 +243,7 @@ void toNative(
      * used like a {@code char*} pointer.
      */
     @ExportLibrary(InteropLibrary.class)
+    @SuppressWarnings("truffle-abstract-export")
     public static final class CByteArrayWrapper extends CArrayWrapper {
 
         public CByteArrayWrapper(byte[] delegate) {