benchmarks/polygraph: Mark as broken on aarch64:

configure:17620: g++10 -o conftest -O2 -pipe -fstack-protector-strong -Wl,-rpath=/usr/local/lib/gcc10 -Wl,-rpath=/usr/local/lib/gcc10 -isystem /usr/local/include -std=gnu++98 -I/usr/include -isystem /usr/local/include -L/usr/lib -fstack-protector-strong -Wl,-rpath=/usr/local/lib/gcc10 -L/usr/local/lib/gcc10 conftest.cc -lssl -lcrypto -lm -L/usr/local/lib >&5
/usr/local/bin/ld: /usr/local/lib/gcc10/libstdc++.so: undefined reference to `floatunditf@GCC_4.2.0'
/usr/local/bin/ld: /usr/local/lib/gcc10/libstdc++.so: undefined reference to `subtf3@GCC_3.0'
/usr/local/bin/ld: /usr/local/lib/gcc10/libstdc++.so: undefined reference to `extendsftf2@GCC_3.0'
/usr/local/bin/ld: /usr/local/lib/gcc10/libstdc++.so: undefined reference to `divtf3@GCC_3.0'
/usr/local/bin/ld: /usr/local/lib/gcc10/libstdc++.so: undefined reference to `floatsitf@GCC_3.0'
/usr/local/bin/ld: /usr/local/lib/gcc10/libstdc++.so: undefined reference to `addtf3@GCC_3.0'
/usr/local/bin/ld: /usr/local/lib/gcc10/libstdc++.so: undefined reference to `letf2@GCC_3.0'
/usr/local/bin/ld: /usr/local/lib/gcc10/libstdc++.so: undefined reference to `fixunstfdi@GCC_3.0'
/usr/local/bin/ld: /usr/local/lib/gcc10/libstdc++.so: undefined reference to `multf3@GCC_3.0'
/usr/local/bin/ld: /usr/local/lib/gcc10/libstdc++.so: undefined reference to `eqtf2@GCC_3.0'
/usr/local/bin/ld: /usr/local/lib/gcc10/libstdc++.so: undefined reference to `__lttf2@GCC_3.0'