build boringssl for curl

boringbuild.sh

#!/bin/sh
CXX=g++ CC=gcc cmake -H. -Bbuild -GNinja -DCMAKE_BUILD_TYPE=release -DBUILD_SHARED_LIBS=1 && cmake --build build
mkdir -p lib
cp ./build/crypto/libcrypto.so ./lib/
cp ./build/ssl/libssl.so ./lib/

cmake --build build --target clean
rm -f build/CMakeCache.txt

CXX="g++" CC="gcc" cmake -H. -Bbuild -GNinja -DCMAKE_POSITION_INDEPENDENT_CODE=on && cmake --build build
cp ./build/crypto/libcrypto.a ./lib/
cp ./build/ssl/libssl.a ./lib/