toolchain/toolchain-buildroot: Disable NPTL for ARC

NPTL is not yet supported for ARC.

Signed-off-by: Mischa Jonker <mjonker@synopsys.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

toolchain/toolchain-buildroot/Config.in.2

@@ -97,6 +97,7 @@ choice
 		depends on !BR2_x86_i386
 		depends on !BR2_avr32
 		depends on !BR2_xtensa
+		depends on !BR2_arc
 endchoice
 
 config BR2_PTHREAD_DEBUG