HarfBuzz 14.* symbol issues

[أحمد المحمودي]

Hello, 

  I have been trying to package Harfbuzz 14 for a while, yet I am 
  hindered by an issue that dpkg-gensymbols reports that symbols in 
  std:: namespace are being exported by libharfbuzz0 & 
  libharfbuzz-subset libraries. Upstream says that they started using 
  `std::sort` at HB 14.0.0. Also upstream build runs a test to check for 
  export of symbols that aren't meant to be exported, and that test 
  passes successfully:
```
[1/15] Generating src/harfbuzz-subset.def with a custom command
[...]
[8/15] Generating src/harfbuzz.def with a custom command
[...]
 27/239 src - harfbuzz:check-symbols                                 OK
[...]
Checking that /home/build/harfbuzz-14.2.0/build-main/src/libharfbuzz.so does not expose internal symbols
Checking that /home/build/harfbuzz-14.2.0/build-main/src/libharfbuzz.so has the same symbol list as /home/build/harfbuzz-14.2.0/build-main/src/harfbuzz.def
Checking that /home/build/harfbuzz-14.0.0/build-main/src/libharfbuzz-subset.so does not expose internal symbols
Checking that /home/build/harfbuzz-14.0.0/build-main/src/libharfbuzz-subset.so has the same symbol list as /home/build/harfbuzz-14.0.0/build-main/src/harfbuzz-subset.def
```

Whole discussion of the issue on upstream bug tracker is on:
https://github.com/harfbuzz/harfbuzz/issues/5895

--
‎أحمد المحمودي (Ahmed El-Mahmoudy)
 Digital design engineer
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