Merge #18004: build: don't embed a build-id when building libdmg-hfsplus

cb9e88e73a build: don't embed a build-id when building libdmg-hfsplus (fanquake)

Pull request description:

  There was a [reproducibility issue (IRC logs)](http://www.erisian.com.au/bitcoin-core-dev/log-2020-01-25.html) with the osx `0.19.1rc1` gitian builds. The `build-id` embedded into the `dmg` tool was mismatching. It's possible that differing versions of binutils/ld were the cause.

  While it was resolved after rebuilding the base gitian image, whether an upstream package issue or fluke, we can remove the possibility of it happening in future by just not embedding a build-id into the `dmg` tool at all. Can close if it's not deemed worth it.

  You can test this change using the following:

  ```bash
  # build libdmg
  make native_libdmg-hfsplus_built -C depends/ HOST=x86_64-apple-darwin16 -j6 V=1

  # master
  readelf --string-dump .note.gnu.build-id /bitcoin/depends/work/build/x86_64-apple-darwin16/native_libdmg-hfsplus/7ac55ec64c96f7800d9818ce64c79670e7f02b67-3830944ef98/build/dmg/dmg

  String dump of section '.note.gnu.build-id':
    [     c]  GNU
    [    11]  CjRa?]?^V8?v?;%n??

  # this pr
  readelf --string-dump  .note.gnu.build-id /bitcoin/depends/work/build/x86_64-apple-darwin16/native_libdmg-hfsplus/7ac55ec64c96f7800d9818ce64c79670e7f02b67-a72f53ab110/build/dmg/dmg
  readelf: Warning: Section '.note.gnu.build-id' was not dumped because it does not exist!
  ```

ACKs for top commit:
  laanwj:
    tested ACK cb9e88e73a

Tree-SHA512: 191eed32ed0a04a908f9c1b22188180b2db2f35bae0281940f0f9da2450c5c6807cd6ff5bbcce7c933a9133387b127c3478f7a39a2918c14f17be19fd9ea19b4

depends/packages/native_libdmg-hfsplus.mk

@@ -12,7 +12,7 @@ define $(package)_preprocess_cmds
 endef
 
 define $(package)_config_cmds
-  cmake -DCMAKE_INSTALL_PREFIX:PATH=$(build_prefix) ..
+  cmake -DCMAKE_INSTALL_PREFIX:PATH=$(build_prefix) -DCMAKE_C_FLAGS="-Wl,--build-id=none" ..
 endef
 
 define $(package)_build_cmds