build: Force default libdir location for libhandy target on Windows to keep MinGW compatibility

5 jobs for mingw64 in 3 minutes and 35 seconds
Status Job ID Name Coverage
  Build
passed #7737
librem5
build-debian-clang

00:02:28

passed #7735
librem5
build-debian-gcc

00:02:47

39.2%
passed #7736
librem5
build-debian-gcc-static

00:01:54

passed #7739
librem5
build-debian-package

00:01:38

failed #7738
librem5
build-fedora-gcc

00:02:15

 
Name Stage Failure
failed
build-fedora-gcc Build
Total download size: 110 M
Installed size: 460 M
Downloading Packages:

The downloaded packages were saved in cache until the next successful transaction.
You can remove cached packages by executing 'dnf clean packages'.
Error: Error downloading packages:
Status code: 503 for https://mirrors.fedoraproject.org/metalink?repo=fedora-29&arch=x86_64
ERROR: Job failed: exit code 1