fix: disable stdckdint.h on Perl 5.44

Gets the following tests passing:
	../cpan/Math-BigInt/t/bare_mbi.t
	../cpan/Math-BigInt/t/bigintpm.t
	../cpan/Math-BigInt/t/sub_mbi.t
	../lib/warnings.t
	op/64bitint.t
	op/inc.t
	op/numify_chkflags.t
	op/pack.t
	op/pow.t
	op/range.t
	op/substr_left.t
	opbasic/arith.t

Author: G4Vi

Changes

@@ -7,6 +7,7 @@ v0.8.0  2026-07-XX
         Remove remove unnecessary constant refactoring in
           dist/threads-shared/shared.xs and cpan/Socket/Socket.xs, not
           needed withcosmo3 compiler.
+        Disable stdckdint.h on Perl 5.44, fixes several tests.
 
 v0.7.0  2026-07-09
         Add Perl 5.40 builds. 5.38 is skipped as static builds were

share/5.44-cosmo3.patch

@@ -745,10 +745,10 @@ index 024c66a147..2741c895ed 100644
 
 diff --git a/hints/cosmo.sh b/hints/cosmo.sh
 new file mode 100644
-index 0000000000..3d7118a4f9
+index 0000000000..72058dddbf
 --- /dev/null
 +++ b/hints/cosmo.sh
-@@ -0,0 +1,21 @@
+@@ -0,0 +1,22 @@
 +#! /bin/sh
 +# cosmo.sh - hints for building perl using the Cosmopolitan Libc
 +#
@@ -762,6 +762,7 @@ index 0000000000..3d7118a4f9
 +osvers=''
 +libpth=''
 +d_procselfexe='undef'
++i_stdckdint='undef'
 +locincpth=''
 +loclibpth=''
 +glibpth=''