gh-39291: Workaround to allow flint to be compiled with numpy 2
    
As discussed in #39241 .

Based on mkoeppe@6247975f786c85c35124a66a
0d32df00260461c5 , but also change the template file.

Note that for tests to pass, #39242
is also needed.
    
URL: #39291
Reported by: user202729
Reviewer(s): Tobias Diez

Author: Release Manager

src/sage/libs/flint/flint_wrap.h

@@ -26,6 +26,10 @@
 #pragma push_macro("ulong")
 #undef ulong
 
+/* Reserved in C99, needed for FLINT without https://github.com/flintlib/flint/pull/2027 */
+#pragma push_macro("I")
+#define I Iv
+
 #include <flint/flint.h>
 
 /* If flint was already previously included via another header (e.g.
@@ -169,6 +173,7 @@
 #undef mp_bitcnt_t
 
 #pragma pop_macro("ulong")
+#pragma pop_macro("I")
 
 /* CPU_SIZE_1 and SIZE_RED_FAILURE_THRESH are defined as macros in flint/fmpz_lll.h
  * and as variables in fplll/defs.h, which breaks build if linbox is compiled with fplll */

src/sage_setup/autogen/flint/templates/flint_wrap.h.template

@@ -26,6 +26,10 @@
 #pragma push_macro("ulong")
 #undef ulong
 
+/* Reserved in C99, needed for FLINT without https://github.com/flintlib/flint/pull/2027 */
+#pragma push_macro("I")
+#define I Iv
+
 #include <flint/flint.h>
 
 /* If flint was already previously included via another header (e.g.
@@ -43,6 +47,7 @@
 #undef mp_bitcnt_t
 
 #pragma pop_macro("ulong")
+#pragma pop_macro("I")
 
 /* CPU_SIZE_1 and SIZE_RED_FAILURE_THRESH are defined as macros in flint/fmpz_lll.h
  * and as variables in fplll/defs.h, which breaks build if linbox is compiled with fplll */