lib: deps: Upgrade vendor version of Pybind11 to 2.6.1

- Copied include/pybind11 directory over from source repo
- Also re-ran remove_comments.py as before

This fixes this warning on newer Python libraries:

.../internals.h: 200:9: warning: 'PyEval_InitThreads' is deprecated
    [-Wdeprecated-declarations]
    PyEval_InitThreads();
    ^
    /usr/include/python3.9/ceval.h:130:1: note: 'PyEval_InitThreads' has
    been explicitly marked deprecated here
    Py_DEPRECATED(3.9) PyAPI_FUNC(void) PyEval_InitThreads(void);
    ^
    /usr/include/python3.9/pyport.h:508:54: note: expanded from macro
    'Py_DEPRECATED'
    #define Py_DEPRECATED(VERSION_UNUSED) __attribute__((__deprecated__))

It also obviates the need for patches to Pybind11 to silence clang
warnings.

1 files changed, 4 insertions, 1 deletions

diff --git a/host/lib/deps/pybind11/README.md b/host/lib/deps/pybind11/README.md
index 16cc54ebb..6622895b2 100644
--- a/host/lib/deps/pybind11/README.md
+++ b/host/lib/deps/pybind11/README.md
@@ -1,6 +1,6 @@
 # PyBind11: Third-Party Dependency for UHD
 
-Version: 25abf7ef (post-2.2.4)
+Version: 2.6.1 (git hash: f1abf5d)
 
 PyBind11 is a replacement for Boost.Python. Unlike Boost.Python, however, we
 ship it with the UHD repository instead of relying on it to be there external to
@@ -9,6 +9,9 @@ most distributions at this time. It also allows us to lock down the version of
 PyBind11 used; with Boost, we often have to apply hacks to make sure UHD works
 across all of the Boost versions that we support.
 
+Note that the UHD CMake allows for using a different version of PyBind11 (e.g.,
+the one installed via package manager).
+
 ## License for PyBind11
 
 As a seperate, third-party project, PyBind11 has a different license from UHD.