MDEV-34825 FreeBSD - upstream riscv64 compatibility patch

From https://github.com/freebsd/freebsd-ports/blob/15d22e1c70da81aaa5751ad0d82f92e9451c4d81/databases/mariadb106-server/files/patch-sql_mysqld.cc

sql/mysqld.cc

@@ -208,7 +208,7 @@ typedef fp_except fp_except_t;
 
 inline void setup_fpu()
 {
-#if defined(__FreeBSD__) && defined(HAVE_IEEEFP_H) && !defined(HAVE_FEDISABLEEXCEPT)
+#if defined(__FreeBSD__) && defined(HAVE_IEEEFP_H) && !defined(HAVE_FEDISABLEEXCEPT) && defined(FP_X_INV)
   /* We can't handle floating point exceptions with threads, so disable
      this on freebsd
      Don't fall for overflow, underflow,divide-by-zero or loss of precision.
@@ -221,7 +221,7 @@ inline void setup_fpu()
   fpsetmask(~(FP_X_INV |             FP_X_OFL | FP_X_UFL | FP_X_DZ |
               FP_X_IMP));
 #endif /* FP_X_DNML */
-#endif /* __FreeBSD__ && HAVE_IEEEFP_H && !HAVE_FEDISABLEEXCEPT */
+#endif /* __FreeBSD__ && HAVE_IEEEFP_H && !HAVE_FEDISABLEEXCEPT && FP_X_INV */
 
 #ifdef HAVE_FEDISABLEEXCEPT
   fedisableexcept(FE_ALL_EXCEPT);