disable nios2 for uClibc, not working.

target/config/Config.in.libc.choice

@@ -10,6 +10,7 @@ config ADK_TARGET_LIB_UCLIBC_NG
 	depends on \
 		   !ADK_TARGET_ARCH_AARCH64 && \
 		   !ADK_TARGET_ARCH_ALPHA && \
+		   !ADK_TARGET_ARCH_NIOS2 && \
 		   !ADK_TARGET_ARCH_SPARC64 && \
 		   !ADK_TARGET_ARCH_PPC64 && \
 		   !ADK_TARGET_ARCH_TILE && \
@@ -52,6 +53,7 @@ config ADK_TARGET_LIB_UCLIBC
 		   !ADK_TARGET_ARCH_ALPHA && \
 		   !ADK_TARGET_ARCH_CRIS && \
 		   !ADK_TARGET_ARCH_MICROBLAZE && \
+		   !ADK_TARGET_ARCH_NIOS2 && \
 		   !ADK_TARGET_ARCH_SPARC64 && \
 		   !ADK_TARGET_ARCH_PPC64 && \
 		   !ADK_TARGET_ARCH_TILE && \