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Use overloadable attribute to aid clang

Fixes
dcigettext.c:147:7: error: redeclaration of 'getcwd' must have the 'overloadable' attribute

Upstream-Status: Pending
Signed-off-by: Khem Raj <raj.khem@gmail.com>
--- a/gettext-runtime/intl/dcigettext.c
+++ b/gettext-runtime/intl/dcigettext.c
@@ -144,7 +144,11 @@ char *getwd ();
 #  if VMS
 #   define getcwd(buf, max) (getcwd) (buf, max, 0)
 #  else
-char *getcwd ();
+char 
+#ifdef __clang__
+__attribute__((overloadable))
+#endif
+*getcwd ();
 #  endif
 # endif
 # ifndef HAVE_STPCPY