[newlib-cygwin] libgloss: fix read and write prototype

[Jeff Johnston]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=4becae7bd833e183c789821a477f25898ed0db1f

commit 4becae7bd833e183c789821a477f25898ed0db1f
Author: Marc <dkm+newlib@kataplop.net>
Date:   Sun May 5 21:16:01 2024 +0200

    libgloss: fix read and write prototype
    
    Use _READ_WRITE_RETURN_TYPE for read/write in libgloss/{read,write}.c to
    avoid mismatching types.
    
    Signed-off-by: Marc Poulhiès <dkm@kataplop.net>

Diff:
---
 libgloss/read.c  | 2 +-
 libgloss/write.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/libgloss/read.c b/libgloss/read.c
index 83a3b549b..867648278 100644
--- a/libgloss/read.c
+++ b/libgloss/read.c
@@ -20,7 +20,7 @@ extern char inbyte (void);
  * read  -- read bytes from the serial port. Ignore fd, since
  *          we only have stdin.
  */
-int
+_READ_WRITE_RETURN_TYPE
 read (int fd,
        void *buf_,
        size_t nbytes)
diff --git a/libgloss/write.c b/libgloss/write.c
index 80bcd4a77..757141291 100644
--- a/libgloss/write.c
+++ b/libgloss/write.c
@@ -21,7 +21,7 @@ extern int  outbyte (char x);
  *          stdout and stderr are the same. Since we have no filesystem,
  *          open will only return an error.
  */
-int
+_READ_WRITE_RETURN_TYPE
 write (int fd,
        const void *buf_,
        size_t nbytes)