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Provide your own breakpad and point cmake at it.

git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git
mkdir breakpad && cd breakpad
../depot_tools/fetch breakpad # edit the script to use python2
cd src
LDFLAGS="-m32" CXXFLAGS="-m32" CFLAGS="-m32" CPPFLAGS="-m32" ./configure
LDFLAGS="-m32" CXXFLAGS="-m32" CFLAGS="-m32" CPPFLAGS="-m32" make -j 8

Run cmake on openrct2:
cd openrct2
vim CMakeLists.txt # provide your path to breakpad
mkdir build && cd build
cmake ../ -DWITH_BREAKPAD=ON
make -j 8
./openrct2 # open a game, select "about openrct2", crash