perf tools: Add compress.h for the *_decompress_to_file() headers

Out of util.h, the implementations were already in separate files, that
are built conditionally.

Link: http://lkml.kernel.org/n/tip-0ur7szxsb59f8758kfe63prb@git.kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/compress.h

+#ifndef PERF_COMPRESS_H
+#define PERF_COMPRESS_H
+
+#ifdef HAVE_ZLIB_SUPPORT
+int gzip_decompress_to_file(const char *input, int output_fd);
+#endif
+
+#ifdef HAVE_LZMA_SUPPORT
+int lzma_decompress_to_file(const char *input, int output_fd);
+#endif
+
+#endif /* PERF_COMPRESS_H */

tools/perf/util/dso.c

@@ -3,6 +3,7 @@
 #include <sys/time.h>
 #include <sys/resource.h>
 #include <errno.h>
+#include "compress.h"
 #include "path.h"
 #include "symbol.h"
 #include "dso.h"

tools/perf/util/lzma.c

@@ -2,6 +2,7 @@
 #include <lzma.h>
 #include <stdio.h>
 #include <linux/compiler.h>
+#include "compress.h"
 #include "util.h"
 #include "debug.h"
 

tools/perf/util/util.h

@@ -99,14 +99,6 @@ void mem_bswap_32(void *src, int byte_size);
 
 bool find_process(const char *name);
 
-#ifdef HAVE_ZLIB_SUPPORT
-int gzip_decompress_to_file(const char *input, int output_fd);
-#endif
-
-#ifdef HAVE_LZMA_SUPPORT
-int lzma_decompress_to_file(const char *input, int output_fd);
-#endif
-
 int get_stack_size(const char *str, unsigned long *_size);
 
 int fetch_kernel_version(unsigned int *puint,

tools/perf/util/zlib.c

@@ -4,6 +4,7 @@
 #include <sys/mman.h>
 #include <zlib.h>
 
+#include "util/compress.h"
 #include "util/util.h"
 #include "util/debug.h"