arch/hppa: remove pa-risc 1.0

The new glibc 2.43 we have in Buildroot since commit [1] introduced changes
around 64B atomics [2], which break the build for PA-RISC 1.0. [3]

This is the only C library we support at this point; forcing soft-float
seems to be a workaround, but as this architecture version was not as
widely used as the later 1.1 and we have no hardware or simulator for it at
this point, remove it completely instead to spare the autobuilders.

Link: 227378b593 [1]
Link: https://sourceware.org/git/?p=glibc.git;a=commit;h=9da0585852e5599ad6e849ccdf2f6f9b04038a3c [2]
Link: https://autobuild.buildroot.org/results/905c7e8db0f8b9014f26925c6e1379a0c54ad446/ [3]
Signed-off-by: Vincent Stehlé <vincent.stehle@laposte.net>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

Config.in.legacy

@@ -278,6 +278,13 @@ config BR2_BINUTILS_VERSION_2_43_X
 	  binutils 2.43 has been removed, select a newer version
 	  instead.
 
+config BR2_parisc10
+	bool "PA-RISC architecture version 1.0 support removed"
+	select BR2_LEGACY
+	help
+	  Following the build issues with glibc 2.43, Buildroot has
+	  removed support for this architecture version.
+
 comment "Legacy options removed in 2026.02"
 
 config BR2_PACKAGE_QEMU_TARGET_CRIS

arch/Config.in.hppa

@@ -3,8 +3,6 @@ choice
 	help
 	  Architecture type (or version) to use.
 
-config BR2_parisc10
-	bool "PA-RISC 1.0"
 config BR2_parisc11
 	bool "PA-RISC 1.1"
 endchoice

arch/arch.mk.hppa

@@ -4,9 +4,7 @@
 
 ifeq ($(BR2_hppa),y)
 
-ifeq ($(BR2_parisc10),y)
-GCC_TARGET_ARCH := 1.0
-else ifeq ($(BR2_parisc11),y)
+ifeq ($(BR2_parisc11),y)
 GCC_TARGET_ARCH := 1.1
 endif