Fix Undefined Type 'uint32_t' by Including <cstdint>

[citb0in]

The following error occurs when trying to compile. It has been reported by many users:

$ make

cd obj &&       mkdir -p GPU
cd obj &&       mkdir -p hash
g++ -m64 -mssse3 -Wno-write-strings -O2 -I. -I/usr/local/cuda-8.0/include -o obj/main.o -c main.cpp
In file included from main.cpp:18:
Timer.h:36:10: error: ‘uint32_t’ does not name a type
   36 |   static uint32_t getSeed32();
      |          ^~~~~~~~
Timer.h:23:1: note: ‘uint32_t’ is defined in header ‘<cstdint>’; did you forget to ‘#include <cstdint>’?
   22 | #include <string>
  +++ |+#include <cstdint>
   23 | #ifdef WIN64
Timer.h:37:27: error: ‘uint32_t’ has not been declared
   37 |   static void SleepMillis(uint32_t millis);
      |                           ^~~~~~~~
main.cpp: In function ‘int main(int, char**)’:
main.cpp:372:16: error: ‘getSeed32’ is not a member of ‘Timer’
  372 |   rseed(Timer::getSeed32());
      |                ^~~~~~~~~

This happens because the type uint32_t is used, but the corresponding definition is missing. uint32_t is one of the standardized data types defined in .
If this header file is not included, the compiler does not recognize the type and issues the error. This type is defined in the header file . The compiler already suggests including the header file.

This patch will fix it.