relocate magic_mgc_gzipped.bin for build (#3179)
relocate magic_mgc_gzipped.bin for build (#3179)

* relocate magic_mgc_gzipped.bin extraction/reference location to <buildtreeroot>/externals/install/include so it doesn't show up in source tree with git

* remove some commented items
TileDB-Inc/TileDB,TileDB-Inc/TileDB,TileDB-Inc/TileDB,TileDB-Inc/TileDB