Generate pkg-config file via CMake (#9945)
Summary:
Fixes https://github.com/facebook/rocksdb/issues/7934
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9945
Test Plan:
Built via Homebrew pointing to my fork/branch:
```
~/src/github.com/facebook/fbthrift on main ❯ cat ~/.homebrew/opt/rocksdb/lib/pkgconfig/rocksdb.pc took 1h 17m 48s at 04:24:54 pm
prefix="/Users/trynity/.homebrew/Cellar/rocksdb/HEAD-968e4dd"
exec_prefix="${prefix}"
libdir="${prefix}/lib"
includedir="${prefix}/include"
Name: rocksdb
Description: An embeddable persistent key-value store for fast storage
URL: https://rocksdb.org/
Version: 7.3.0
Cflags: -I"${includedir}"
Libs: -L"${libdir}" -lrocksdb
```
Reviewed By: riversand963
Differential Revision: D36161635
Pulled By: trynity
fbshipit-source-id: 0f1a9c30e43797ee65e6696896e06fde0658456e
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