Added src directory to link

* Cleanup warnings with nvhpc/21.9.

* Move __NVCOMPILER check.

* Be more explicit.

* Immediately executed lambda.

* Fix shadowing warning.

'os.h' accepts a predefined FMT_USE_FCNTL override so using FMT with e.g. the NXP toolchain for ARM (e.g. for FreeRTOS) does not have a fcntl() call, but the detection routine does not detect this correctly.

* Fix unicode test

* Add xchar support to chrono formatter

* Replace strftime with std::time_put

* Add std::locale support to std::tm formatter

* Use predefined names and formats for C-locale

* Performance improvement

* Make locale-independent and C locale formats consistent among platforms

Switch internal year calculations to long long

When build the docs for debian package, it uses a sphinx building
helper, which does a sanity check for the output.

The sanity check complains missing data-url_root attribute in the
js tag. So this patch changes the js tag to use the same function like
the origin basic theme, which adds additional information like
data-url_root.

Ref: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=997437

Requested changes