[newlib-cygwin] riscv: Fix fenv.h support

[Sebastian Huber]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=696c282cf32b478b4e11bd8af23663aa99156cb3

commit 696c282cf32b478b4e11bd8af23663aa99156cb3
Author: Sebastian Huber <sebastian.huber@embedded-brains.de>
Date:   Thu Oct 12 11:59:32 2023 +0200

    riscv: Fix fenv.h support
    
    Use the same C preprocessor expressions to define FE_RMODE_MASK and
    __RISCV_HARD_FLOAT.
    
    The problem was noticed on GCC 10 which does not define __riscv_f.

Diff:
---
 newlib/libc/machine/riscv/sys/fenv.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/newlib/libc/machine/riscv/sys/fenv.h b/newlib/libc/machine/riscv/sys/fenv.h
index 1d577d527..98387d220 100644
--- a/newlib/libc/machine/riscv/sys/fenv.h
+++ b/newlib/libc/machine/riscv/sys/fenv.h
@@ -14,7 +14,7 @@
 
 #include <stddef.h>
 
-#if defined(__riscv_f) || defined(__riscv_zfinx)
+#if defined(__riscv_flen) || defined(__riscv_zfinx)
 
 /* Per "The RISC-V Instruction Set Manual: Volume I: User-Level ISA:
  * Version 2.1", Section 8.2, "Floating-Point Control and Status