[PATCH] x86: Export _proxy_pda for gcc 4.2

The symbol is not actually used, but the compiler unforunately generates
a (unused) reference to it. This can happen even in modules. So export it.
Signed-off-by: Andi Kleen <ak@suse.de>

arch/i386/kernel/i386_ksyms.c

@@ -28,3 +28,5 @@ EXPORT_SYMBOL(__read_lock_failed);
 #endif
 
 EXPORT_SYMBOL(csum_partial);
+
+EXPORT_SYMBOL(_proxy_pda);

arch/x86_64/kernel/x8664_ksyms.c

@@ -59,3 +59,4 @@ EXPORT_SYMBOL(empty_zero_page);
 EXPORT_SYMBOL(init_level4_pgt);
 EXPORT_SYMBOL(load_gs_index);
 
+EXPORT_SYMBOL(_proxy_pda);