perf tools: Move extra string util functions to util/string2.h

Moving them from util.h, where they don't belong. Since libc already
have string.h, name it slightly differently, as string2.h.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-eh3vz5sqxsrdd8lodoro4jrw@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/ui/browser.c

@@ -1,4 +1,5 @@
 #include "../util.h"
+#include "../string2.h"
 #include "../config.h"
 #include "../../perf.h"
 #include "libslang.h"

tools/perf/ui/browsers/hists.c

@@ -20,6 +20,7 @@
 #include "map.h"
 #include "annotate.h"
 #include "srcline.h"
+#include "string2.h"
 
 #include "sane_ctype.h"
 

tools/perf/ui/gtk/hists.c

@@ -4,6 +4,7 @@
 #include "../sort.h"
 #include "../hist.h"
 #include "../helpline.h"
+#include "../string2.h"
 #include "gtk.h"
 
 #define MAX_COLUMNS			32

tools/perf/ui/stdio/hist.c

@@ -5,6 +5,7 @@
 #include "../../util/sort.h"
 #include "../../util/evsel.h"
 #include "../../util/srcline.h"
+#include "../../util/string2.h"
 #include "../../util/sane_ctype.h"
 
 static size_t callchain__fprintf_left_margin(FILE *fp, int left_margin)