HUGE changeset to make the rest of the libraries compile with C++ mode

git-svn-id: https://svn.pjsip.org/repos/pjproject/trunk@1266 74dad513-b988-da41-8d7b-12977e46ad98
diff --git a/pjlib/src/pj/os_error_unix.c b/pjlib/src/pj/os_error_unix.c
index d3cfe14..3d4b526 100644
--- a/pjlib/src/pj/os_error_unix.c
+++ b/pjlib/src/pj/os_error_unix.c
@@ -40,6 +40,12 @@
     errno = PJ_STATUS_TO_OS(code);
 }
 
+PJ_BEGIN_DECL
+
+    PJ_DECL(int) platform_strerror(pj_os_err_type code, 
+                              	   char *buf, pj_size_t bufsize );
+PJ_END_DECL
+
 /* 
  * platform_strerror()
  *