sci-mathematics/polymake: trivial build fix for newer compilers

Closes: https://bugs.gentoo.org/939388
Signed-off-by: Michael Orlitzky <mjo@gentoo.org>

sci-mathematics/polymake/files/polymake-4.13-cstdint.patch

@@ -0,0 +1,13 @@
+diff --git a/lib/core/include/internal/comparators.h b/lib/core/include/internal/comparators.h
+index 57e3f14..3486f80 100644
+--- a/lib/core/include/internal/comparators.h
++++ b/lib/core/include/internal/comparators.h
+@@ -17,6 +17,8 @@
+ 
+ #pragma once
+ 
++#include <cstdint>
++
+ #include "polymake/internal/comparators_ops.h"
+ #include "polymake/internal/matrix_rows_cols.h"
+ #include "polymake/TransformedContainer.h"

sci-mathematics/polymake/polymake-4.13.ebuild

@@ -53,6 +53,8 @@ RDEPEND="${DEPEND}
 	dev-perl/XML-SAX
 	dev-perl/XML-Writer"
 
+PATCHES=( "${FILESDIR}/${P}-cstdint.patch" )
+
 src_configure() {
 	# Without this, the build system tries to use "the highest possible"
 	# optimization level and will override what's in your CXXFLAGS.