bug#44989: GHC@8.6.5 can't find errno.h

[raingloom]

Haven't had a chance to try with latest version, because there is no
substitute yet.
It's a very basic Haskell file, only imports are Data.List and
System.IO. GHCI works.

I'm pretty sure I didn't need to add any other packages to my profile
when I last used GHC, but maybe things have changed since then or I'm
misremembering, or I usde to have just the right assortment of packages.

error:
```
ghc -o sol1 sol1.hs
Linking sol1 ...
In file included from
/gnu/store/fa6wj5bxkj5ll1d7292a70knmyl7a0cr-glibc-2.31/include/errno.h:28,
from
/gnu/store/55c0m16dwnmmp3pah1hqx1941niwi6x4-ghc-8.6.5/lib/ghc-8.6.5/include/rts/OSThreads.h:28,
from
/gnu/store/55c0m16dwnmmp3pah1hqx1941niwi6x4-ghc-8.6.5/lib/ghc-8.6.5/include/Rts.h:168,

                 from /tmp/ghc1915_0/ghc_1.c:1:0: error: 

/gnu/store/fa6wj5bxkj5ll1d7292a70knmyl7a0cr-glibc-2.31/include/bits/errno.h:26:11:
error: fatal error: linux/errno.h: No such file or directory
       26 | # include <linux/errno.h>
          |           ^~~~~~~~~~~~~~~
   |
26 | # include <linux/errno.h>
   |           ^
compilation terminated.
`gcc' failed in phase `C Compiler'. (Exit code: 1)
```

manifest:
```
;; This file was automatically generated and is for internal use only.
;; It cannot be passed to the '--manifest' option.

(manifest
  (version 3)
  (packages
    (("ghc"
      "8.6.5"
      "out"
      "/gnu/store/55c0m16dwnmmp3pah1hqx1941niwi6x4-ghc-8.6.5"
      (propagated-inputs ())
      (search-paths
        (("GHC_PACKAGE_PATH"
          ("lib/ghc-8.6.5")
          ":"
          directory
          ".*\\.conf\\.d$")))
      (properties))
     ("racket-minimal"
      "7.9"
      "out"
      "/gnu/store/sy5k16y2cgdk2f8dq0if8vxs48xlgnfh-racket-minimal-7.9"
      (propagated-inputs ())
      (search-paths ())
      (properties))
     ("gcc-toolchain"
      "10.2.0"
      "out"
      "/gnu/store/pknm43xsza6nlc7bn27djip8fis92akd-gcc-toolchain-10.2.0"
      (propagated-inputs ())
      (search-paths
        (("C_INCLUDE_PATH" ("include") ":" directory #f)
         ("CPLUS_INCLUDE_PATH"
          ("include/c++" "include")
          ":"
          directory
          #f)
         ("LIBRARY_PATH" ("lib" "lib64") ":" directory #f)
         ("GUIX_LOCPATH" ("lib/locale") ":" directory #f)))
      (properties))
     ("chez-scheme"
      "9.5.2"
      "out"
      "/gnu/store/abaa0mw2pss8ad0a7dazjwgrynim3yg5-chez-scheme-9.5.2"
      (propagated-inputs ())
      (search-paths
        (("CHEZSCHEMELIBDIRS"
          ("lib/csv9.5.2-site")
          ":"
          directory
          #f)))
      (properties))
     ("rlwrap"
      "0.43"
      "out"
      "/gnu/store/7q500p5srzg8hx56z63fr0myc2h7fzxh-rlwrap-0.43"
      (propagated-inputs ())
      (search-paths ())
      (properties))
     ("idris2"
      "0.2.1-1.a5a5d89"
      "out"
      "/gnu/store/z0nx9yr279wsx6nba2ssidhi449h0m4z-idris2-0.2.1-1.a5a5d89"
      (propagated-inputs ())
      (search-paths ())
      (properties)))))
```