[PATCH] kernel-shark: Fix compile error: ‘string’ in namespace ‘std’ does not name a type

["Tzvetomir Stoyanov (VMware)" <tz.stoyanov@xxxxxxxxx>]

From: Tzvetomir (VMware)  Stoyanov <tz.stoyanov@xxxxxxxxx>

There is a compilation error when compiling KernelShark on Fedora 33
with c++ (GCC) 10.2.1:

  src/KsPlotTools.hpp:349:37: error: ‘string’ in namespace ‘std’ does not name a type

"string" should be included in that header file, as it is a direct
dependency.

Signed-off-by: Tzvetomir (VMware)  Stoyanov <tz.stoyanov@xxxxxxxxx>
---
 src/KsPlotTools.hpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/KsPlotTools.hpp b/src/KsPlotTools.hpp
index 1725926..68bd6f7 100644
--- a/src/KsPlotTools.hpp
+++ b/src/KsPlotTools.hpp
@@ -15,6 +15,7 @@
 // C++
 #include <forward_list>
 #include <unordered_map>
+#include <string>
 
 // KernelShark
 #include "libkshark.h"
-- 
2.29.2