Drop support for armv6l (and armv7hl)

This removes support for building IPFire for 32 bit ARM architectures.

This has been decided in August 2022 with six months notice as there are
not very many users and hardware is generally not available any more.

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

lfs/Config

@@ -58,37 +58,12 @@ PARALLELISM = $(shell echo $$( \
 
 MAKETUNING = -j$(PARALLELISM)
 
-ifeq "$(BUILD_ARCH)" "aarch64"
-	IS_64BIT = 1
-endif
-
-ifeq "$(BUILD_ARCH)" "armv7hl"
-	IS_32BIT = 1
-endif
-
-ifeq "$(BUILD_ARCH)" "armv6l"
-	IS_32BIT = 1
-endif
-
-ifeq "$(BUILD_ARCH)" "x86_64"
-	IS_64BIT = 1
-endif
-
-ifeq "$(BUILD_ARCH)" "riscv64"
-	IS_64BIT = 1
-endif
-
 ifeq "$(TOOLCHAIN)" "1"
 	PREFIX = $(TOOLS_DIR)
 else
 	PREFIX = /usr
 endif
 
-# Permit building with 32 bit time_t on 32 bit architectures
-ifeq "$(IS_32BIT)" "1"
-	export TIME_T_32_BIT_OK = yes
-endif
-
 TAR_OPTIONS = \
 	--format=pax \
 	--acls \
@@ -163,11 +138,7 @@ else
 	RUST_ARCH = $(BUILD_ARCH)
 endif
 
-ifeq "$(BUILD_ARCH)" "armv6l"
-	RUST_PLATFORM = arm-unknown-linux-gnueabi
-else
-	RUST_PLATFORM = $(RUST_ARCH)-unknown-linux-gnu
-endif
+RUST_PLATFORM = $(RUST_ARCH)-unknown-linux-gnu
 
 CARGO_PATH     = $(DIR_APP)/.cargo
 CARGO_REGISTRY = /usr/share/cargo/registry