package/glibc: remove nios2 support

Doing so, we remove nios2 support from the internal toolchain backend.

Signed-off-by: Romain Naour <romain.naour@smile.fr>
Signed-off-by: Julien Olivain <ju.o@free.fr>

arch/Config.in

@@ -145,6 +145,7 @@ config BR2_mips64el
 
 config BR2_nios2
 	bool "Nios II"
+	select BR2_ARCH_HAS_NO_TOOLCHAIN_BUILDROOT
 	select BR2_USE_MMU
 	help
 	  Nios II is a soft core processor from Altera Corporation.

package/glibc/Config.in

@@ -20,7 +20,6 @@ config BR2_PACKAGE_GLIBC_ARCH_SUPPORTS
 	default y if BR2_sparc64
 	default y if BR2_x86_64
 	default y if BR2_microblaze
-	default y if BR2_nios2
 	default y if BR2_arc && BR2_ARC_ATOMIC_EXT && !BR2_arc750d && !BR2_arc770d
 	depends on !BR2_POWERPC_CPU_HAS_SPE
 	depends on BR2_RISCV_ISA_RVA || !BR2_riscv

package/glibc/glibc.mk

@@ -143,10 +143,6 @@ endif
 # Glibc nowadays can be build with optimization flags f.e. -Os
 
 GLIBC_CFLAGS = $(TARGET_OPTIMIZATION)
-# crash in qemu-system-nios2 with -Os
-ifeq ($(BR2_nios2),y)
-GLIBC_CFLAGS += -O2
-endif
 
 # glibc can't be built without optimization
 ifeq ($(BR2_OPTIMIZE_0),y)