Also define signed stdint types on windows

include/starpu.h

@@ -30,6 +30,11 @@ typedef unsigned short uint16_t;
 typedef unsigned int uint32_t;
 typedef unsigned long long uint64_t;
 typedef UINT_PTR uintptr_t;
+typedef char int8_t;
+typedef short int16_t;
+typedef int int32_t;
+typedef long long int64_t;
+typedef INT_PTR intptr_t;
 #endif
 
 #include <starpu_config.h>