ar71xx: fix build of lzma-loader with binutils 2.25.1

To make the lzma-loader build with binutils 2.25.1 it is needed to
remove the .MIPS.abiflags section otherwise I get the following compile
error:

mips-openwrt-linux-musl-objcopy -O binary -R .reginfo -R .note -R .comment -R .mdebug -S loader loader.bin
mips-openwrt-linux-musl-objcopy: Warning: Writing section `.text' to huge (ie negative) file offset 0xffffffff80a00000.
mips-openwrt-linux-musl-objcopy:loader.bin[.text]: File truncated

This should close #20487.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

SVN-Revision: 46893

target/linux/ar71xx/image/lzma-loader/src/Makefile

@@ -27,7 +27,8 @@ LD		:= $(CROSS_COMPILE)ld
 OBJCOPY		:= $(CROSS_COMPILE)objcopy
 OBJDUMP		:= $(CROSS_COMPILE)objdump
 
-BIN_FLAGS	:= -O binary -R .reginfo -R .note -R .comment -R .mdebug -S
+BIN_FLAGS	:= -O binary -R .reginfo -R .note -R .comment -R .mdebug \
+		   -R .MIPS.abiflags -S
 
 CFLAGS		= -D__KERNEL__ -Wall -Wstrict-prototypes -Wno-trigraphs -Os \
 		  -fno-strict-aliasing -fno-common -fomit-frame-pointer -G 0 \