openblas: fix pkg-config alias name

[timokau]

Motivation for this change

Fixup for #45257 (which I already had locally but forgot to push to that PR before merging).

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nox --run "nox-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Fits CONTRIBUTING.md.

---

[GrahamcOfBorg]

Success on aarch64-linux (full log)

Attempted: openblas

Partial log (click to expand)

Install OK!
make[1]: Leaving directory '/build/source'
post-installation fixup
shrinking RPATHs of ELF executables and libraries in /nix/store/p5fa0aqyd5bmlppsdsjzkfwn072d6kbv-openblas-0.3.1
shrinking /nix/store/p5fa0aqyd5bmlppsdsjzkfwn072d6kbv-openblas-0.3.1/lib/libopenblas_armv8p-r0.3.1.so
strip is /nix/store/y4ymnvgxygpq05h03kyzbj572zmh6zla-binutils-2.30/bin/strip
stripping (with command strip and flags -S) in /nix/store/p5fa0aqyd5bmlppsdsjzkfwn072d6kbv-openblas-0.3.1/lib  /nix/store/p5fa0aqyd5bmlppsdsjzkfwn072d6kbv-openblas-0.3.1/bin
patching script interpreter paths in /nix/store/p5fa0aqyd5bmlppsdsjzkfwn072d6kbv-openblas-0.3.1
checking for references to /build in /nix/store/p5fa0aqyd5bmlppsdsjzkfwn072d6kbv-openblas-0.3.1...
/nix/store/p5fa0aqyd5bmlppsdsjzkfwn072d6kbv-openblas-0.3.1

[GrahamcOfBorg]

Success on x86_64-linux (full log)

Attempted: openblas

Partial log (click to expand)

Generating OpenBLASConfigVersion.cmake in /nix/store/kdydfbazf3smj2s7w3kgc3n8rs4da1gr-openblas-0.3.1/lib/cmake/openblas
Install OK!
make[1]: Leaving directory '/build/source'
post-installation fixup
shrinking RPATHs of ELF executables and libraries in /nix/store/kdydfbazf3smj2s7w3kgc3n8rs4da1gr-openblas-0.3.1
shrinking /nix/store/kdydfbazf3smj2s7w3kgc3n8rs4da1gr-openblas-0.3.1/lib/libopenblasp-r0.3.1.so
strip is /nix/store/h0lbngpv6ln56hjj59i6l77vxq25flbz-binutils-2.30/bin/strip
stripping (with command strip and flags -S) in /nix/store/kdydfbazf3smj2s7w3kgc3n8rs4da1gr-openblas-0.3.1/lib  /nix/store/kdydfbazf3smj2s7w3kgc3n8rs4da1gr-openblas-0.3.1/bin
patching script interpreter paths in /nix/store/kdydfbazf3smj2s7w3kgc3n8rs4da1gr-openblas-0.3.1
checking for references to /build in /nix/store/kdydfbazf3smj2s7w3kgc3n8rs4da1gr-openblas-0.3.1...

[GrahamcOfBorg]

Timed out, unknown build status on x86_64-darwin (full log)

Attempted: openblas

Partial log (click to expand)

cannot build derivation '/nix/store/gv5yn93nkjaw027aibsssn6x42n501rp-mpfr-4.0.1.drv': 1 dependencies couldn't be built
cannot build derivation '/nix/store/nw5h61jr39cl45bm9dlwxhbpbg6cscm1-perl-5.28.0.drv': 2 dependencies couldn't be built
cannot build derivation '/nix/store/z2jmxfhh8bhjlp1ykb8485jk8xr97i7w-which-2.21.drv': 1 dependencies couldn't be built
cannot build derivation '/nix/store/ypr7acy0danajssfmsb4f1mkgmxwcsvq-libelf-0.8.13.drv': 2 dependencies couldn't be built
cannot build derivation '/nix/store/4nyg6sa19skw072i42laldxz788nzdq3-libmpc-1.1.0.drv': 2 dependencies couldn't be built
cannot build derivation '/nix/store/wyp5wksw03q1pz3s3dybfykk7l1jzj9h-texinfo-6.5.drv': 3 dependencies couldn't be built
cannot build derivation '/nix/store/x3xphhqpddxlrhb7a17gq7m644pz8krp-gfortran-7.3.0.drv': 9 dependencies couldn't be built
cannot build derivation '/nix/store/3z08nfqma43rmz3y1pp7wjjmnhg4yfs6-gfortran-wrapper-7.3.0.drv': 3 dependencies couldn't be built
cannot build derivation '/nix/store/az5fqv1jmllysp8l61qn6s27baylzyy2-openblas-0.3.1.drv': 4 dependencies couldn't be built
error: build of '/nix/store/az5fqv1jmllysp8l61qn6s27baylzyy2-openblas-0.3.1.drv' failed