toolchain/uClibc: 0.9.30.x config: enable arch specific string routines if available

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

toolchain/uClibc/uClibc-0.9.30.config

@@ -135,7 +135,7 @@ UCLIBC_USE_NETLINK=y
 # String and Stdio Support
 #
 # UCLIBC_HAS_STRING_GENERIC_OPT is not set
-# UCLIBC_HAS_STRING_ARCH_OPT is not set
+UCLIBC_HAS_STRING_ARCH_OPT=y
 UCLIBC_HAS_CTYPE_TABLES=y
 UCLIBC_HAS_CTYPE_SIGNED=y
 # UCLIBC_HAS_CTYPE_UNSAFE is not set