wget2 | Support linkage from C++ modules (!511)

[Michael Lee (@michael2e2)]

Michael Lee created a merge request: 
https://gitlab.com/gnuwget/wget2/-/merge_requests/511

Project:Branches: ml2e2/wget2:fix-cpp-linkage to gnuwget/wget2:master
Author:   Michael Lee




Fix issue: https://gitlab.com/gnuwget/wget2/-/issues/612

While 'restrict' is a reserved keyword in C99 (described in C99-6.4.1-1), it is 
not true in any standard of C++ (from C++11 to C++20). Since we cannot compile 
C++ modules with '-std=gnu99' option, we shall use GCC extension (i.e., 
'\_\_restrict' or '\_\_restrict\_\_') to gain the similar or equivalent 
optimization benefits provided by compiler. 

This is the same workaround adopted by GLIBC: 
https://sourceware.org/git/?p=glibc.git;a=blob;f=posix/spawn.h;h=c4a81227b04490b817ed4a5784f2e5a47c4ccbf7;hb=HEAD#l72





### Approver's checklist:

* [ ] The author has submitted the FSF Copyright Assignment and is listed in 
AUTHORS
* [ ] There is a test suite reasonably covering new functionality or 
modifications
* [ ] Function naming, parameters, return values, types, etc., are consistent 
with existing code
* [ ] This feature/change has adequate documentation added (if appropriate)
* [ ] No obvious mistakes / misspelling in the code

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