math/mpsolve: Fix build

Add patch that removes redefined isnan that is added in the project
for systems w/out isnan (I guess).

Reported by:	fallout

math/mpsolve/files/patch-include_mps_types.h

@@ -0,0 +1,20 @@
+- workaround for https://github.com/robol/MPSolve/issues/38
+
+--- include/mps/types.h.orig	2023-11-09 17:34:55 UTC
++++ include/mps/types.h
+@@ -22,6 +22,7 @@ typedef int mps_debug_level;
+ 
+ /* Handle systems where isnan and isinf are not available */
+ #include <math.h>
++#if 0
+ #ifndef isnan
+           # define isnan(x) \
+   (sizeof(x) == sizeof(long double) ? isnan_ld (x) \
+@@ -58,6 +59,7 @@ static inline int isinf_ld (long double x)
+ {
+   return !isnan (x) && isnan (x - x);
+ }
++#endif
+ #endif
+ 
+ #include <mps/mt-types.h>