iptables: opt-out of lto usage

This fixes building with USE_LTO enabled.

<artificial>:(.text+0xc22): relocation R_MIPS16_26 against `libxt_DNAT_init' cannot be used when making a shared object; recompile with -fPIC
./openwrt/staging_dir/toolchain-mips_24kc_gcc-12.3.0_musl/lib/gcc/mips-openwrt-linux-musl/12.3.0/../../../../mips-openwrt-linux-musl/bin/ld.bfd: non-dynamic relocations refer to dynamic symbol printf
./openwrt/staging_dir/toolchain-mips_24kc_gcc-12.3.0_musl/lib/gcc/mips-openwrt-linux-musl/12.3.0/../../../../mips-openwrt-linux-musl/bin/ld.bfd: failed to set dynamic section sizes: bad value
collect2: error: ld returned 1 exit status

Signed-off-by: Anari Jalakas <[email protected]>
(cherry picked from commit 5dbdf3b)

package/network/utils/iptables/Makefile

@@ -20,7 +20,7 @@ PKG_FIXUP:=autoreconf
 PKG_FLAGS:=nonshared
 
 PKG_INSTALL:=1
-PKG_BUILD_FLAGS:=gc-sections
+PKG_BUILD_FLAGS:=gc-sections no-lto
 PKG_BUILD_PARALLEL:=1
 PKG_LICENSE:=GPL-2.0
 PKG_CPE_ID:=cpe:/a:netfilter_core_team:iptables