community/ldc: upgrade to 1.37.0

Changelog: https://github.com/ldc-developers/ldc/releases/tag/v1.37.0

I added two patches to support musl libc in ldc 1.36.0. They correspond to ldc-developers/ldc#4575 and commit 0055e6a respectively. They are already merged in ldc 1.37.0.

I also enable the following tests by removing them from the ignored list because ldc 1.36.0 passes them: core.thread.fiber, druntime-test-thread, and druntime-test-gc.

I added std.file* (i.e., std.file and std.file-shared) to the ignored list due to segfault.

$ abuild -r
...
99% tests passed, 2 tests failed out of 1810

Total Test time (real) =  29.53 sec

The following tests FAILED:
        356 - std.file (SEGFAULT)
        1222 - std.file-shared (SEGFAULT)
Errors while running CTest
...