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.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

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"