[ARM] Fix _unlink prototype under ARM_RDI_MONITOR.

[Christophe Lyon]

Hi,

I noticed that "path" is actually used when compiling with
ARM_RDI_MONITOR, so this small patch removes the unused attribute in
that case.

OK?

Christophe
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commit 421cd7000646b4462df0195ba2d43a093fdd9851
Author: Christophe Lyon <christophe.lyon@linaro.org>
Date:   Mon Oct 1 16:15:35 2018 +0000

    [ARM] Fix _unlink prototype under ARM_RDI_MONITOR.
    
    2018-10-01  Christophe Lyon  <christophe.lyon@linaro.org>
    
    	* newlib/libc/sys/arm/syscalls.c (_unlink): Remove unused
    	attribute when compiling with ARM_RDI_MONITOR.

diff --git a/newlib/libc/sys/arm/syscalls.c b/newlib/libc/sys/arm/syscalls.c
index 311b28d..6d2ad79 100644
--- a/newlib/libc/sys/arm/syscalls.c
+++ b/newlib/libc/sys/arm/syscalls.c
@@ -534,7 +534,11 @@ _link (const char *__path1 __attribute__ ((unused)),
 }
 
 int
+#ifdef ARM_RDI_MONITOR
+_unlink (const char *path)
+#else
 _unlink (const char *path __attribute__ ((unused)))
+#endif
 {
 #ifdef ARM_RDI_MONITOR
   int block[2];