Fix auditwheel manylinux compliance scripts

tests/manylinux_compliant.sh

@@ -1,6 +1,8 @@
 #!/bin/bash
+set -e
+
 which cargo > /dev/null 2>&1 || curl -sSf https://sh.rustup.rs | sh -s -- -y --profile minimal
 
-for PYBIN in /opt/python/cp3[6789]*/bin; do
+for PYBIN in /opt/python/cp3[789]*/bin; do
   cargo run -- build --no-sdist -m test-crates/pyo3-mixed/Cargo.toml -i "${PYBIN}/python" --manylinux $1 -o dist
 done

tests/manylinux_incompliant.sh

@@ -1,4 +1,6 @@
 #!/bin/bash
+set -e
+
 which cargo > /dev/null || curl -sSf https://sh.rustup.rs | sh -s -- -y --profile minimal
 
 # Fail because we're running in manylinux2014, which can't build for manylinux 2010