Please create a new official release

[haampie]

Hello, I spend a bit of time trying to figure out why libflame 5.2.0 did not build for me, only to realize I hit the bug where using absolute paths in CC=/absolute/path/to/gcc instead of CC=gcc would fail to guess the openmp flags.

This bug was fixed in 2019 1188aa4

Can you please create a new release so that no more developer time is wasted on this? It'd be great to work with tagged releases for reproducibility, etc.