Fixes errors such as these:

In file included from /builddir/build/BUILD/z3-z3-4.12.2/src/util/region.cpp:53:
/builddir/build/BUILD/z3-z3-4.12.2/src/util/region.cpp: In member function ‘void* region::allocate(size_t)’:
/builddir/build/BUILD/z3-z3-4.12.2/src/util/tptr.h:29:62: error: ‘uintptr_t’ does not name a type
   29 | #define ALIGN(T, PTR) reinterpret_cast<T>(((reinterpret_cast<uintptr_t>(PTR) >> PTR_ALIGNMENT) + \
      |                                                              ^~~~~~~~~
/builddir/build/BUILD/z3-z3-4.12.2/src/util/region.cpp:82:22: note: in expansion of macro ‘ALIGN’
   82 |         m_curr_ptr = ALIGN(char *, new_curr_ptr);
      |                      ^~~~~
/builddir/build/BUILD/z3-z3-4.12.2/src/util/region.cpp:57:1: note: ‘uintptr_t’ is defined in header ‘<cstdint>’; did you forget to ‘#include <cstdint>’?
   56 | #include "util/page.h"
  +++ |+#include <cstdint>
   57 | 

--- z3-z3-4.12.2/src/util/tptr.h.orig	2023-05-12 13:59:04.000000000 -0600
+++ z3-z3-4.12.2/src/util/tptr.h	2023-05-13 07:04:48.389716628 -0600
@@ -19,6 +19,7 @@ Revision History:
 
 #pragma once
 
+#include <cstdint>
 #include "util/machine.h"
 
 #define TAG_SHIFT        PTR_ALIGNMENT