build armv7l images (#669)

* build armv7l images

* Update build-docker-images.yml

* Don't use `enable-ec_nistp_64_gcc_128` on armv7l

* hack?

* We are an armv4 build

(cherry picked from commit 519b16bd0803ea22dbd0a4525c641060581c0215)

Author: alex

build-scripts/manylinux-container-image/install_openssl.sh

@@ -21,6 +21,11 @@ BUILD_FLAGS="$OPENSSL_BUILD_FLAGS"
 if [[ "$1" =~ '^manylinux1_.*$' ]]; then
   PATH=/opt/perl/bin:$PATH
 fi
+# Can't use `$(uname -m) = "armv7l"` because that returns what kernel we're
+# using, and we build for armv7l with an ARM64 host.
+if [ "$(readelf -h /proc/self/exe | grep -o 'Machine:.* ARM')" ]; then
+    BUILD_FLAGS="$OPENSSL_BUILD_FLAGS_ARMV7L"
+fi
 if [ "$(readelf -h /proc/self/exe | grep -o 'Machine:.* S/390')" ]; then
     BUILD_FLAGS="$OPENSSL_BUILD_FLAGS_S390X"
     export CFLAGS="$CFLAGS -march=z10"

build-scripts/manylinux-container-image/openssl-version.sh

@@ -3,5 +3,6 @@ export OPENSSL_SHA256="344d0a79f1a9b08029b0744e2cc401a43f9c90acd1044d09a530b4885
 # We need a base set of flags because on Windows using MSVC
 # enable-ec_nistp_64_gcc_128 doesn't work since there's no 128-bit type
 export OPENSSL_BUILD_FLAGS_WINDOWS="no-ssl3 no-ssl3-method no-zlib no-shared no-module no-comp no-dynamic-engine no-apps no-docs no-sm2-precomp no-atexit"
+export OPENSSL_BUILD_FLAGS_ARMV7L="linux-armv4 ${OPENSSL_BUILD_FLAGS_WINDOWS}"
 export OPENSSL_BUILD_FLAGS_S390X="${OPENSSL_BUILD_FLAGS_WINDOWS}"
 export OPENSSL_BUILD_FLAGS="${OPENSSL_BUILD_FLAGS_WINDOWS} enable-ec_nistp_64_gcc_128"