toolchain: default to glibc for ARC

glibc 2.32 gained support for the ARC architecture.

This is preparation for removing uClibc-ng.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

toolchain/Config.in

@@ -237,7 +237,7 @@ comment "C Library"
 
 choice
 	prompt "C Library implementation" if TOOLCHAINOPTS
-	default LIBC_USE_UCLIBC if arc
+	default LIBC_USE_GLIBC if arc
 	default LIBC_USE_MUSL
 	help
 	  Select the C library implementation.
@@ -245,7 +245,6 @@ choice
 	config LIBC_USE_GLIBC
 		bool "Use glibc"
 		select USE_GLIBC
-		depends on !arc
 
 	config LIBC_USE_UCLIBC
 		select USE_UCLIBC