zlib change broke x86 builds

I know we don't officially support x86 anymore but we do publish unofficial-builds x86 and the Snap package has x86 support too. But I've just noticed they haven't been building, I suppose since zlib was switched out: ``` cc -o /build/node/parts/node/build/out/Release/obj.target/zlib/deps/zlib/contrib/optimizations/inflate.o ../deps/zlib/contrib/optimizations/inflate.c '-DV8_DEPRECATION_WARNINGS' '-DV8_IMMINENT_DEPRECATION_WARNINGS' '-D__STDC_FORMAT_MACROS' '-DOPENSSL_NO_PINSHARED' '-DOPENSSL_THREADS' '-DHAVE_HIDDEN' '-DADLER32_SIMD_SSSE3' '-DINFLATE_CHUNK_SIMD_SSE2' '-DCRC32_SIMD_SSE42_PCLMUL' -I../deps/zlib -pthread -Wall -Wextra -Wno-unused-parameter -m32 -O3 -fno-omit-frame-pointer -MMD -MF /build/node/parts/node/build/out/Release/.deps//build/node/parts/node/build/out/Release/obj.target/zlib/deps/zlib/contrib/optimizations/inflate.o.d.raw -c In file included from ../deps/zlib/contrib/optimizations/inffast_chunk.c:10:0: ../deps/zlib/contrib/optimizations/chunkcopy.h: In function ‘loadchunk’: ../deps/zlib/contrib/optimizations/chunkcopy.h:52:5: warning: SSE vector return without SSE enabled changes the ABI [-Wpsabi] const unsigned char FAR* s) { ^ In file included from ../deps/zlib/contrib/optimizations/inflate.c:87:0: ../deps/zlib/contrib/optimizations/chunkcopy.h: In function ‘loadchunk’: ../deps/zlib/contrib/optimizations/chunkcopy.h:52:5: warning: SSE vector return without SSE enabled changes the ABI [-Wpsabi] const unsigned char FAR* s) { ^ In file included from ../deps/zlib/contrib/optimizations/chunkcopy.h:32:0, from ../deps/zlib/contrib/optimizations/inffast_chunk.c:10: ../deps/zlib/contrib/optimizations/chunkcopy.h: In function ‘v_load64_dup’: /usr/lib/gcc/i686-linux-gnu/5/include/emmintrin.h:625:1: error: inlining failed in call to always_inline ‘_mm_set1_epi64x’: target specific option mismatch _mm_set1_epi64x (long long __A) ^ In file included from ../deps/zlib/contrib/optimizations/inffast_chunk.c:10:0: ..…