Remove -fcoroutines-ts flag when clang (>= 16.0) is used

[smtrfnv]

• -fcoroutines-ts was deprecated in clang 16.0
• -fcoroutines-ts was removed in clang 17.0
• clang 16, clang 17 and clang 18 do not like -fcoroutines flag either

Some examples of errorsI encountered when trying to use either -fcoroutines-ts or -fcoroutines flag with modern clang:

• CLANG-16, CPP20 DBG

clang-16: error: the '-fcoroutines-ts' flag is deprecated and it will be removed in Clang 17; use '-std=c++20' or higher to use standard C++ coroutines instead [-Werror,-Wdeprecated-experimental-coroutine]

• CLANG-18, CPP03 DBG

clang++clang++: : warning: argument unused during compilation: '-fcoroutines' [-Wunused-command-line-argument]

• CLANG-18, CPP20 DBG

clang++clang++: : error: error: argument unused during compilation: '-fcoroutines' [-Werror,-Wunused-command-line-argument]

• CLANG-18, CPP20 OPT

clang++: error: argument unused during compilation: '-fcoroutines' [-Werror,-Wunused-command-line-argument]