Remove unused chunk_size.c.

Thanks to Jonathan Nieder for the reminder.

src/liblzma/common/chunk_size.c

@@ -1,67 +0,0 @@
-///////////////////////////////////////////////////////////////////////////////
-//
-/// \file       chunk_size.c
-/// \brief      Finds out the minimal reasonable chunk size for a filter chain
-//
-//  Author:     Lasse Collin
-//
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
-///////////////////////////////////////////////////////////////////////////////
-
-#include "common.h"
-
-
-/**
- * \brief       Finds out the minimal reasonable chunk size for a filter chain
- *
- * This function helps determining the Uncompressed Sizes of the Blocks when
- * doing multi-threaded encoding.
- *
- * When compressing a large file on a system having multiple CPUs or CPU
- * cores, the file can be split into smaller chunks, that are compressed
- * independently into separate Blocks in the same .lzma Stream.
- *
- * \return      Minimum reasonable Uncompressed Size of a Block. The
- *              recommended minimum Uncompressed Size is between this value
- *              and the value times two.
-
- Zero if the Uncompressed Sizes of Blocks don't matter
- */
-extern LZMA_API(size_t)
-lzma_chunk_size(const lzma_options_filter *filters)
-{
-	while (filters->id != LZMA_VLI_UNKNOWN) {
-		switch (filters->id) {
-		// TODO LZMA_FILTER_SPARSE
-
-		case LZMA_FILTER_COPY:
-		case LZMA_FILTER_SUBBLOCK:
-		case LZMA_FILTER_X86:
-		case LZMA_FILTER_POWERPC:
-		case LZMA_FILTER_IA64:
-		case LZMA_FILTER_ARM:
-		case LZMA_FILTER_ARMTHUMB:
-		case LZMA_FILTER_SPARC:
-			// These are very fast, thus there is no point in
-			// splitting the data into smaller blocks.
-			break;
-
-		case LZMA_FILTER_LZMA1:
-			// The block sizes of the possible next filters in
-			// the chain are irrelevant after the LZMA filter.
-			return ((lzma_options_lzma *)(filters->options))
-					->dictionary_size;
-
-		default:
-			// Unknown filters
-			return 0;
-		}
-
-		++filters;
-	}
-
-	// Indicate that splitting would be useless.
-	return SIZE_MAX;
-}