chore: remove unused COMPRESS_CCTX binding (#17)

ZSTD_compressCCtx is never called — one-shot compression goes through
ZSTD_compress2 (COMPRESS2) with the context's advanced parameters. Drop
the dead handle. Swept the rest of Bindings; it was the only one unused.

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

Author: dfa1

zstd/src/main/java/io/github/dfa1/zstd/Bindings.java

@@ -111,10 +111,6 @@ final class Bindings {
     // size_t ZSTD_freeCCtx(ZSTD_CCtx*)
     static final MethodHandle FREE_CCTX =
             NativeLibrary.lookup("ZSTD_freeCCtx", FunctionDescriptor.of(JAVA_LONG, ADDRESS));
-    // size_t ZSTD_compressCCtx(ZSTD_CCtx*, void* dst, size_t dstCap, const void* src, size_t srcSize, int level)
-    static final MethodHandle COMPRESS_CCTX =
-            NativeLibrary.lookup("ZSTD_compressCCtx",
-                    FunctionDescriptor.of(JAVA_LONG, ADDRESS, ADDRESS, JAVA_LONG, ADDRESS, JAVA_LONG, JAVA_INT));
 
     // ZSTD_DCtx* ZSTD_createDCtx(void)
     static final MethodHandle CREATE_DCTX =