crt: Preprocess all .def.in files with -DDEF_<ARCH>

Having -DDEF_<ARCH> is required by func.def.in which is used either
directly or indirectly by crt-aliases.def.in in all CRT def.in files.
Some symbols in crt-aliases.def.in are defined via F* macros and these
symbols are currently missing in versioned non-os msvcrt import libraries.

This change is fixing missing symbols in all CRT import libraries.

Signed-off-by: Martin Storsjö <martin@martin.st>
(cherry picked from commit 93f81148ec477370f224801fac0135cfc9e35a04)
1 file changed