bug#60584: Broken graft on clang-toolchain

[Greg Hogan]

The recent zlib graft (from 1.2.11 to 1.2.12) is broken when grafting
clang-toolchain. The symbolic link points to the correct directory but
the incorrect file version.

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$ guix package -m development.scm
...
build of /gnu/store/r8088hz3i9gz5543ajdk2qv5ngblawk3-clang-toolchain-15.0.5.drv
failed
View build log at
'/var/log/guix/drvs/r8/088hz3i9gz5543ajdk2qv5ngblawk3-clang-toolchain-15.0.5.drv.gz'.
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--8<---------------cut here---------------start------------->8---
$ zcat 
/var/log/guix/drvs/r8/088hz3i9gz5543ajdk2qv5ngblawk3-clang-toolchain-15.0.5.drv.gz
grafting 
'/gnu/store/nzi37a18qxaxzns50dgvnb53z55rjpbv-clang-toolchain-15.0.5-debug'
-> '/gnu/store/k82qkqqi1h6z604ng00c7rv104aylv1x-clang-toolchain-15.0.5-debug'...
grafting '/gnu/store/q6qdzivkmxa4c8k6dk7z2yivsz8m26vz-clang-toolchain-15.0.5'
-> '/gnu/store/f1gc5894gsgc5v2b4zhmpll9yg1bmgl0-clang-toolchain-15.0.5'...
grafting 
'/gnu/store/bpwxrgdxr9zym16c3clbdhhnm82mrzm2-clang-toolchain-15.0.5-static'
-> 
'/gnu/store/ccy8jw83j11y02d74q4vs1lzsp5xn7c7-clang-toolchain-15.0.5-static'...
Backtrace:
In ice-9/boot-9.scm:
 160: 13 [catch #t #<catch-closure 7ffff5ce7c00> ...]
In unknown file:
   ?: 12 [apply-smob/1 #<catch-closure 7ffff5ce7c00>]
In ice-9/boot-9.scm:
  66: 11 [call-with-prompt prompt0 ...]
In ice-9/eval.scm:
 432: 10 [eval # #]
In ice-9/boot-9.scm:
2412: 9 [save-module-excursion #<procedure 7ffff5d087c0 at
ice-9/boot-9.scm:4084:3 ()>]
4089: 8 [#<procedure 7ffff5d087c0 at ice-9/boot-9.scm:4084:3 ()>]
1734: 7 [%start-stack load-stack ...]
1739: 6 [#<procedure 7ffff5d1a6c0 ()>]
In unknown file:
   ?: 5 [primitive-load
"/gnu/store/qnpvxpxdc6lciqbny3pp5b3c5zl20lsh-clang-toolchain-15.0.5-builder"]
In srfi/srfi-1.scm:
 616: 4 [for-each #<procedure 7ffff5665980 at
guix/build/graft.scm:445:12 (hook)> #]
In guix/build/debug-link.scm:
 195: 3 [graft-debug-links (# # #) (# # #) (# # # # ...) ...]
In srfi/srfi-1.scm:
 643: 2 [append-map #<procedure 7ffff5b3b780 at
guix/build/debug-link.scm:177:14 (directory)> ...]
 575: 1 [map #<procedure 7ffff5b3b780 at
guix/build/debug-link.scm:177:14 (directory)> ...]
In unknown file:
   ?: 0 [filter #<procedure 7ffff581e1e0 at guix/build/utils.scm:278:2
(file)> #]

ERROR: In procedure filter:
ERROR: In procedure open-file: No such file or directory:
"/gnu/store/f1gc5894gsgc5v2b4zhmpll9yg1bmgl0-clang-toolchain-15.0.5/lib/libz.so.1.2.11"
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$ ll 
/gnu/store/f1gc5894gsgc5v2b4zhmpll9yg1bmgl0-clang-toolchain-15.0.5/lib/libz.so.1.2.11
lrwxrwxrwx 1 guixbuilder01 guixbuild 74 Jan  5 19:19
/gnu/store/f1gc5894gsgc5v2b4zhmpll9yg1bmgl0-clang-toolchain-15.0.5/lib/libz.so.1.2.11
-> /gnu/store/v8d7j5i02nfz951x1szbl9xrd873vc3l-zlib-1.2.12/lib/libz.so.1.2.11
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--8<---------------cut here---------------start------------->8---
$ ll /gnu/store/v8d7j5i02nfz951x1szbl9xrd873vc3l-zlib-1.2.12/lib/
total 116
lrwxrwxrwx 1 root root     14 Jan  1  1970 libz.so -> libz.so.1.2.12
lrwxrwxrwx 1 root root     14 Jan  1  1970 libz.so.1 -> libz.so.1.2.12
-r-xr-xr-x 2 root root 117216 Jan  1  1970 libz.so.1.2.12
dr-xr-xr-x 2 root root     21 Jan  1  1970 pkgconfig
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