Include `<cstdint>` in one place, remove custom typedefs

Originating from
[this SO issue](https://stackoverflow.com/questions/65901014/how-to-solve-this-all-error-2-in-this-case),
some win32 compilers define `__int32` as a `long`, but MinGW defines
`std::int32_t` as an `int`, leading to a type conflict.

To avoid this, we remove the custom `typedef` definitions for win32.  The
Tensor module requires C++11 anyways, so we are guaranteed to have
included `<cstdint>` already in `Eigen/Core`.

Also re-arranged the headers to only include `<cstdint>` in one place to
avoid this type of error again.

1 files changed, 4 insertions, 6 deletions

diff --git a/Eigen/src/Core/arch/ZVector/PacketMath.h b/Eigen/src/Core/arch/ZVector/PacketMath.h
index eb378a164..b10c1f6c7 100755
--- a/Eigen/src/Core/arch/ZVector/PacketMath.h
+++ b/Eigen/src/Core/arch/ZVector/PacketMath.h
@@ -10,8 +10,6 @@
 #ifndef EIGEN_PACKET_MATH_ZVECTOR_H
 #define EIGEN_PACKET_MATH_ZVECTOR_H
 
-#include <stdint.h>
-
 namespace Eigen {
 
 namespace internal {
@@ -51,10 +49,10 @@ typedef struct {
 #endif
 
 typedef union {
-  int32_t   i[4];
-  uint32_t ui[4];
-  int64_t   l[2];
-  uint64_t ul[2];
+  numext::int32_t   i[4];
+  numext::uint32_t ui[4];
+  numext::int64_t   l[2];
+  numext::uint64_t ul[2];
   double    d[2];
   float     f[4];
   Packet4i  v4i;