Wraps self.cc_path in quotes when building the toolchain defines extraction command. This fixes the issue where microcontroller names containing spaces (e.g., 'Feather M0') would cause the command to be split incorrectly.
Fixes#4894
* Improved file filtering for the Static Analysis feature
* Better handling of legacy "check_patterns" option
* Rename "check_src_filter" to plural form to better represent functionality
* Move to plural forms of filter variables
* Fixed an issue when configuration file options partly ignored when using custom ``--project-conf`` // Resolve#3034
* Py2 compatible makedirs
* Fix circle dependency
* Fix broken import in test examples
* Fix history
* Remove YAPF markers
* PyLint fix
* Fix invalid project conf path
* Move PIO Core to the root on Windows, issue with long CPPPATHs
* Respect global PLATFORMIO_BUILD_CACHE_DIR env var
* Fix Appveyor paths
* Minor changes
valeros