In C++, a function declaration with an empty parameter list means that
the function takes no arguments. In C, however, it means that the
function takes an unspecified number of parameters.
What we did previously was therefore non-conforming. This caused a
config check to fail in the curl port, as it was able to redeclare
`rand` as taking an int parameter.
This fixes a build issue where `compiler-rt` tried to declare its own
version of the `FE_*` macros, and included `float.h` in order to get the
constants. `compiler-rt` tried to declare these as an enum, and failed
with a syntax error when the constant's literal values were substituted.
SPDX License Identifiers are a more compact / standardized
way of representing file license information.
See: https://spdx.dev/resources/use/#identifiers
This was done with the `ambr` search and replace tool.
ambr --no-parent-ignore --key-from-file --rep-from-file key.txt rep.txt *
