[newlib-cygwin] Remove unneccesary parenthesis around declarator

[Corinna Vinschen <corinna@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=05425831290c9869bc7987b5df3ce84aa4f19a6c

commit 05425831290c9869bc7987b5df3ce84aa4f19a6c
Author: Maxim Blinov <maxim.blinov@embecosm.com>
Date:   Thu Jul 22 22:41:42 2021 +0100

    Remove unneccesary parenthesis around declarator
    
    riscv64-unknown-elf-g++-11.1.0 regression suite reports the following
    failures for
    
    $ make check-gcc-c++ RUNTESTFLAGS='dg.exp=Wstringop-overflow-6.C'
    
    ```
    FAIL: g++.dg/warn/Wstringop-overflow-6.C  -std=gnu++14 (test for excess errors)
    FAIL: g++.dg/warn/Wstringop-overflow-6.C  -std=gnu++17 (test for excess errors)
    FAIL: g++.dg/warn/Wstringop-overflow-6.C  -std=gnu++2a (test for excess errors)
    UNSUPPORTED: g++.dg/warn/Wstringop-overflow-6.C  -std=gnu++98
    ```
    
    The "excess errors" being
    
    ```
    output is In file included from /home/maxim/prj/riscv-upstream/install/riscv64-unknown-elf/include/wchar.h:6,
                     from /home/maxim/prj/riscv-upstream/build/gcc-stage2/riscv64-unknown-elf/libstdc++-v3/include/cwchar:44,
                     from /home/maxim/prj/riscv-upstream/build/gcc-stage2/riscv64-unknown-elf/libstdc++-v3/include/bits/postypes.h:40,
                     from /home/maxim/prj/riscv-upstream/build/gcc-stage2/riscv64-unknown-elf/libstdc++-v3/include/iosfwd:40,
                     from /home/maxim/prj/riscv-upstream/build/gcc-stage2/riscv64-unknown-elf/libstdc++-v3/include/ios:38,
                     from /home/maxim/prj/riscv-upstream/build/gcc-stage2/riscv64-unknown-elf/libstdc++-v3/include/ostream:38,
                     from /home/maxim/prj/riscv-upstream/build/gcc-stage2/riscv64-unknown-elf/libstdc++-v3/include/iostream:39,
                     from /home/maxim/prj/riscv-upstream/gcc-11.1.0/gcc/testsuite/g++.dg/warn/Wstringop-overflow-6.C:6:
    /home/maxim/prj/riscv-upstream/install/riscv64-unknown-elf/include/sys/reent.h:685:11: warning: unnecessary parentheses in declaration of '_sig_func' [-Wparentheses]
    ```

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

diff --git a/newlib/libc/include/sys/reent.h b/newlib/libc/include/sys/reent.h
index 74b70e9c0..e4e36170e 100644
--- a/newlib/libc/include/sys/reent.h
+++ b/newlib/libc/include/sys/reent.h
@@ -682,7 +682,7 @@ struct _reent
 # endif
 
   /* signal info */
-  void (**(_sig_func))(int);
+  void (**_sig_func)(int);
 
   /* These are here last so that __FILE can grow without changing the offsets
      of the above members (on the off chance that future binary compatibility