[New package] Add rocFFT 4.2.0

[jpsamaroo]

Currently broken, but posting to have this out there in case anyone can help figure out these build failures (@haampie ?).

[jpsamaroo]

I managed to get this working locally (HIP_ROCCLR_HOME was wrong), and am waiting on it to succeed before kicking off CI.

[jpsamaroo]

@giordano this one takes a while, so if you want to kill it and have me limit nprocs, I can do that.

[giordano]

On musl

21:51:21] /workspace/srcdir/rocFFT-rocm-4.2.0/build/library/src/device/kernel_launch_single_2D_pow2.cpp.h:1:6174: warning: null character ignored [-Wnull-character]
[21:51:21] /workspace/srcdir/rocFFT-rocm-4.2.0/build/library/src/device/kernel_launch_single_2D_pow2.cpp.h:1:6175: warning: null character ignored [-Wnull-character]
[21:51:21] /workspace/srcdir/rocFFT-rocm-4.2.0/build/library/src/device/kernel_launch_single_2D_pow2.cpp.h:1:6176: warning: null character ignored [-Wnull-character]
[21:51:21] /workspace/srcdir/rocFFT-rocm-4.2.0/build/library/src/device/kernel_launch_single_2D_pow2.cpp.h:1:6177: warning: null character ignored [-Wnull-character]
[21:51:21] /workspace/srcdir/rocFFT-rocm-4.2.0/build/library/src/device/kernel_launch_single_2D_pow2.cpp.h:1:6178: warning: null character ignored [-Wnull-character]
[21:51:21] /workspace/srcdir/rocFFT-rocm-4.2.0/build/library/src/device/kernel_launch_single_2D_pow2.cpp.h:1:6179: warning: null character ignored [-Wnull-character]
[21:51:21] /workspace/srcdir/rocFFT-rocm-4.2.0/build/library/src/device/kernel_launch_single_2D_pow2.cpp.h:1:6180: warning: null character ignored [-Wnull-character]

I seem to remember you get these warnings when the file is actually a binary file (and I have the recollection that clang might also dump to screen the entire file in some cases)