meson: Strip quotes from BR2_ENDIAN

The values in the cross-compilation file are expected to be quoted with
single quotes, which we have in our template.

However, the endian value we are injecting comes from Kconfig, so it is
double-quoted, and those quotes end up in the cross-compilation files we
generate (the internal one, and the SDK one):

    endian = '"little"'

So qstrip the value before we inject it.

Propagate the fix to the two generated files by using the same variable
HOST_MESON_TARGET_ENDIAN in both cases, rather than replicating the
(flawed) logic.

While at it, also use the common GCC_TARGET_CPU variable for the SDK
file too.

Signed-off-by: Gleb Mazovetskiy <glex.spb@gmail.com>
Reviewed-by: Peter Seiderer <ps.report@gmx.net>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
(cherry picked from commit 92eca65ddf)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/meson/meson.mk

@@ -13,7 +13,7 @@ MESON_SETUP_TYPE = setuptools
 HOST_MESON_DEPENDENCIES = host-ninja
 HOST_MESON_NEEDS_HOST_PYTHON = python3
 
-HOST_MESON_TARGET_ENDIAN = $(call LOWERCASE,$(BR2_ENDIAN))
+HOST_MESON_TARGET_ENDIAN = $(call qstrip,$(call LOWERCASE,$(BR2_ENDIAN)))
 HOST_MESON_TARGET_CPU = $(GCC_TARGET_CPU)
 
 # https://mesonbuild.com/Reference-tables.html#cpu-families

package/pkg-meson.mk

@@ -69,8 +69,8 @@ define $(2)_CONFIGURE_CMDS
 	mkdir -p $$($$(PKG)_SRCDIR)/build
 	sed -e 's%@TARGET_CROSS@%$$(TARGET_CROSS)%g' \
 	    -e 's%@TARGET_ARCH@%$$(HOST_MESON_TARGET_CPU_FAMILY)%g' \
-	    -e 's%@TARGET_CPU@%$$(GCC_TARGET_CPU)%g' \
-	    -e 's%@TARGET_ENDIAN@%$$(call LOWERCASE,$$(BR2_ENDIAN))%g' \
+	    -e 's%@TARGET_CPU@%$$(HOST_MESON_TARGET_CPU)%g' \
+	    -e 's%@TARGET_ENDIAN@%$$(HOST_MESON_TARGET_ENDIAN)%g' \
 	    -e 's%@TARGET_CFLAGS@%$$(call make-comma-list,$$($(2)_CFLAGS))%g' \
 	    -e 's%@TARGET_LDFLAGS@%$$(call make-comma-list,$$($(2)_LDFLAGS))%g' \
 	    -e 's%@TARGET_CXXFLAGS@%$$(call make-comma-list,$$($(2)_CXXFLAGS))%g' \