fiber/switch_context_riscv.S: disable executable stack (#4968)

Like it is done for the other assembly files, add the GNU-stack note.

Signed-off-by: Andrei Horodniceanu <a.horodniceanu@proton.me>

Author: the-horo

runtime/druntime/src/core/thread/fiber/switch_context_asm.S

@@ -13,13 +13,13 @@
  *          http://www.boost.org/LICENSE_1_0.txt)
  */
 
-#if (__linux__ || __FreeBSD__ || __NetBSD__ || __OpenBSD__ || __DragonFly__) && __ELF__
+#if __ELF__
 /*
  * Mark the resulting object file as not requiring execution permissions on
  * stack memory. The absence of this section would mark the whole resulting
  * library as requiring an executable stack, making it impossible to
- * dynamically load druntime on several Linux platforms where this is
- * forbidden due to security policies.
+ * dynamically load druntime on several platforms where this is forbidden
+ * due to security policies.
  */
 .section .note.GNU-stack,"",%progbits
 #endif

runtime/druntime/src/core/thread/fiber/switch_context_riscv.S

@@ -6,6 +6,18 @@
  * Authors:   Denis Feklushkin
  */
 
+#if __ELF__
+/*
+ * Mark the resulting object file as not requiring execution permissions on
+ * stack memory. The absence of this section would mark the whole resulting
+ * library as requiring an executable stack, making it impossible to
+ * dynamically load druntime on several platforms where this is forbidden
+ * due to security policies.
+ */
+.section .note.GNU-stack,"",%progbits
+#endif
+
+
 #if defined(__riscv)
 
 // For save/load a register in memory, regardless of the size of machine register bit size

runtime/druntime/src/ldc/eh_asm.S

@@ -6,15 +6,14 @@
  * License:   <a href="http://www.boost.org/LICENSE_1_0.txt">Boost License 1.0</a>.
  */
 
+#if __ELF__
 /*
  * Mark the resulting object file as not requiring execution
  * permissions on stack memory. The absence of this section would mark
  * the whole resulting library as requiring an executable stack,
- * making it impossible to dynamically load druntime on several Linux
+ * making it impossible to dynamically load druntime on several
  * platforms where this is forbidden due to security policies.
  */
-
-#if (defined(__linux__) || defined(__FreeBSD__)) && defined(__ELF__)
 .section .note.GNU-stack,"",%progbits
 .previous
 #endif