nios2: Require GCC older than 15

As per https://gcc.gnu.org/gcc-14/changes.html nios2 will be removed in
GCC 15. Even in GCC 14 we need to pass --enable-obsolete to allow this
target. Update our samples accordingly.

Signed-off-by: Chris Packham <judge.packham@gmail.com>

config/arch/nios2.in

@@ -7,6 +7,7 @@
 ## select ARCH_DEFAULT_LE
 ## select ARCH_SUPPORTS_WITH_ARCH
 ## select ARCH_SUPPORTS_FLAT_FORMAT
+## select GCC_REQUIRE_older_than_15
 ##
 ## help The NIOS2 architecture, as defined by:
 ## help     http://www.altera.com

samples/i686-w64-mingw32,nios2-spico-elf/crosstool.config

@@ -7,5 +7,7 @@ CT_TOOLCHAIN_BUGURL="https://bitbucket.org/netzimme/eax-gcc/issues?status=new&st
 CT_TARGET_VENDOR="spico"
 CT_CANADIAN=y
 CT_HOST="i686-w64-mingw32"
+CT_CC_GCC_CORE_EXTRA_CONFIG_ARRAY="--enable-obsolete"
+CT_CC_GCC_EXTRA_CONFIG_ARRAY="--enable-obsolete"
 CT_CC_LANG_CXX=y
 CT_DEBUG_GDB=y

samples/nios2-altera-linux-gnu/crosstool.config

@@ -3,6 +3,8 @@ CT_ARCH_NIOS2=y
 CT_ARCH_USE_MMU=y
 CT_TARGET_VENDOR="altera"
 CT_KERNEL_LINUX=y
+CT_CC_GCC_CORE_EXTRA_CONFIG_ARRAY="--enable-obsolete"
+CT_CC_GCC_EXTRA_CONFIG_ARRAY="--enable-obsolete"
 CT_CC_LANG_CXX=y
 CT_DEBUG_GDB=y
 # CT_GDB_CROSS_PYTHON is not set

samples/nios2-unknown-elf/crosstool.config

@@ -1,5 +1,7 @@
 CT_CONFIG_VERSION="4"
 CT_ARCH_NIOS2=y
+CT_CC_GCC_CORE_EXTRA_CONFIG_ARRAY="--enable-obsolete"
+CT_CC_GCC_EXTRA_CONFIG_ARRAY="--enable-obsolete"
 CT_CC_LANG_CXX=y
 CT_DEBUG_GDB=y
 # CT_GDB_CROSS_PYTHON is not set