Including missing headers required for non-pch builds and other architectures

Source/Core/Common/ArmCPUDetect.cpp

@@ -5,6 +5,7 @@
 #include <fstream>
 #include <sstream>
 #include <string>
+#include <unistd.h>
 #include <asm/hwcap.h>
 #include <sys/auxv.h>
 

Source/Core/Common/NandPaths.cpp

@@ -4,6 +4,7 @@
 
 #include <cstdio>
 #include <fstream>
+#include <stdlib.h>
 #include <string>
 #include <utility>
 

Source/Core/Common/Network.cpp

@@ -3,6 +3,7 @@
 // Refer to the license.txt file included.
 
 #include <cctype>
+#include <cstdlib>
 #include <cstring>
 #include <ctime>