[Powertop] [PATCH] src/main: Add missing pthread header

[Rosen Penev <rosenp at gmail.com>]

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Otherwise compilation can fail with:

main.cpp: In function 'void one_measurement(int, int, char*)':
main.cpp:226:3: error: 'pthread_t' was not declared in this scope
   pthread_t thread = 0UL;
   ^~~~~~~~~
main.cpp:226:3: note: suggested alternative: 'pread'
   pthread_t thread = 0UL;
   ^~~~~~~~~
   pread

et al.

Signed-off-by: Rosen Penev <rosenp(a)gmail.com>
---
 src/main.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/main.cpp b/src/main.cpp
index cbb7a4e..75d4202 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -39,6 +39,7 @@
 #include <locale.h>
 #include <sys/resource.h>
 #include <limits.h>
+#include <pthread.h>
 
 #include "cpu/cpu.h"
 #include "process/process.h"
-- 
2.17.1