A pkg-config file was previously installed only if cpp-httplib was being
built as a compiled library.
Since architecture-independent .pc files
can exist in /usr/share/pkgconfig, it can be useful to install one even
when installing the header-only version (for example, it could be used
by third party projects to easily find out if cpp-httplib is installed
and its version, using something like Meson's `dependency()` or CMake's
`pkg_check_modules()`).
The change makes the Meson build behave a bit more like the CMake one,
as it also always installs a CMake Config file, but here the pkg-config
file gets installed to the correct architecture-independent directory
(`datadir` represents /usr/share on Linux and simiar systems).
Lastly, I made some minor cleanups.
This change is based on RFC7230, § 3.5 'Message Parsing Robustness': "Although the line terminator for the start-line and header fields is the sequence CRLF, a recipient MAY recognize a single LF as a line terminator and ignore any preceding CR."
* Fix#1041
* Fixed problem with is_socket_alive
* Adjust the way to check if the sockt is still alive.
* Revert "Adjust the way to check if the sockt is still alive."
This reverts commit 6c673b21e5.
* Adjust is_socket_alive according to the code review
