Remove select() and use poll() (#2078)

* Revert "Fix typo in meson.build (#2070)"

This reverts commit 5c0135fa5d.

* Revert "build(meson): automatically use poll or select as needed (#2067)"

This reverts commit 2b5d1eea8d.

* Revert "Make poll() the default (#2065)"

This reverts commit 6e73a63153.

* Remove select() and use poll()

README.md

@@ -872,11 +872,6 @@ res->body; // Compressed data
 
 ```
 
-Use `select()` instead of `poll()`
-----------------------------------
-
-cpp-httplib defaults to the widely supported `poll()` system call. If your OS lacks support for `poll()`, define `CPPHTTPLIB_USE_SELECT` to use `select()` instead.
-
 Unix Domain Socket Support
 --------------------------