uclibc: add RPC config variables to 0.9.30

Add UCLIBC_HAS_{FULL,REENTRANT}_RPC config variables to the defconfig, so
the sed invocation in uclibc.mk can set them to the proper values.

toolchain/uClibc/uClibc-0.9.30.config

@@ -125,6 +125,8 @@ UCLIBC_HAS_SOCKET=y
 UCLIBC_HAS_IPV4=y
 # UCLIBC_HAS_IPV6 is not set
 # UCLIBC_HAS_RPC is not set
+# UCLIBC_HAS_FULL_RPC is not set
+# UCLIBC_HAS_REENTRANT_RPC is not set
 UCLIBC_USE_NETLINK=y
 UCLIBC_SUPPORT_AI_ADDRCONFIG=y
 # UCLIBC_HAS_BSD_RES_CLOSE is not set