[klibc] [patch] alpha build fix

[maximilian attems]

fix builderror introduced in 1.3.3
commit 	67a8defdb192d3b7361f5d93099f1864c9626fc5:
klibc/syscalls/SYSCALLS.i:187: Undefined system call: sigprocmask

thanks to Falk Hueffner <falk at debian.org> for checking belows fix
see: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=361910

Signed-off-by: maximilian attems <maks at sternwelten.at>
 
diff --git a/include/arch/alpha/klibc/archconfig.h b/include/arch/alpha/klibc/archconfig.h
index 773ea62..2878f84 100644
--- a/include/arch/alpha/klibc/archconfig.h
+++ b/include/arch/alpha/klibc/archconfig.h
@@ -9,6 +9,6 @@
 #ifndef _KLIBC_ARCHCONFIG_H
 #define _KLIBC_ARCHCONFIG_H
 
-/* All defaults */
+#define _KLIBC_USE_RT_SIG 1
 
 #endif /* _KLIBC_ARCHCONFIG_H */