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Math C library feature detection now works for wasm
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The previous feature detection generated C stubs like:
.. code-block:: C
void exp(void); // incorrect signature!
exp();
Then checked whether compiling and linking these worked. This generates warnings
that complain that ``exp`` actually has signature ``double exp(double)`` but would
otherwise work. However ``wasm-ld`` creates a hard error in this case, so when
compiling to a wasm target everything is detected as missing.
This is now fixed: we feature detect instead with code like:
.. code-block:: C
double exp(double); // correct signature!
exp((double)0);
which ``wasm-ld`` will link. As a side effect, the feature detection code now
works without generating linker warnings.
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