fix(crc32c): refactor pyenv check to avoid subshell and string comparison

Author: chalmerlowe

packages/google-crc32c/scripts/osx/build_python_wheel.sh

@@ -40,8 +40,7 @@ eval "$(pyenv init --path)"
 install_python_pyenv() {
     version=$1
     escaped_version="${version//./\.}"
-
-    if [ -z "$(pyenv versions --bare | grep "^${escaped_version}\b")" ]; then
+    if ! pyenv versions --bare | grep -q "^${escaped_version}\b"; then
         echo "Python $version is not installed. Installing..."
         pyenv install $version
         echo "Python $version installed."

packages/google-crc32c/scripts/osx/publish_python_wheel.sh

@@ -15,7 +15,7 @@
 
 set -eo pipefail
 
-if [ -z "$(pyenv versions --bare | grep "^3\.10\b")" ]; then
+if ! pyenv versions --bare | grep -q "^3\.10\b"; then
     echo "Python 3.10 is not installed. Installing..."
     pyenv install 3.10
 fi