ARROW-2723: [C++] Add .pc for arrow orc

[shiro615]

No description provided.

[codecov-io]

Codecov Report

Merging #2148 into master will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2148      +/-   ##
==========================================
- Coverage   86.42%   86.39%   -0.03%     
==========================================
  Files         242      230      -12     
  Lines       41536    40644     -892     
==========================================
- Hits        35896    35116     -780     
+ Misses       5640     5528     -112

Impacted Files	Coverage Δ
cpp/src/arrow/util/thread-pool-test.cc	98.91% <0%> (-0.55%)	⬇️
rust/src/list_builder.rs
rust/src/buffer.rs
rust/src/bitmap.rs
rust/src/record_batch.rs
rust/src/datatypes.rs
rust/src/error.rs
rust/src/lib.rs
rust/src/memory.rs
rust/src/array.rs
... and 3 more

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[kou]

+1