libcamera: utils: Add method to remove non-ASCII characters

Add method that removes non-ASCII characters from a string.

Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Umang Jain <email@uajain.com>

include/libcamera/internal/utils.h

@@ -190,6 +190,8 @@ private:
 
 details::StringSplitter split(const std::string &str, const std::string &delim);
 
+std::string toAscii(const std::string &str);
+
 std::string libcameraBuildPath();
 std::string libcameraSourcePath();