PARQUET-448: Add cmake options to not build tests and/or executables

This patch adds `PARQUET_BUILD_TESTS` and `PARQUET_BUILD_EXECUTABLES` options.

For example:

```
$ cmake -DPARQUET_BUILD_TESTS=OFF -DPARQUET_BUILD_EXECUTABLES=OFF ..
```

This will accelerate builds in 3rd-party use. When the library is more mature we can set the default for `PARQUET_BUILD_TESTS` to `OFF`

Author: Wes McKinney <wes@cloudera.com>

Closes apache#39 from wesm/PARQUET-448 and squashes the following commits:

6bf6a54 [Wes McKinney] Add cmake options to not build tests and/or executables

Change-Id: Iff0745b88eed7265b8c4905e7db1e860d21b60ca

cpp/src/parquet/util/CMakeLists.txt

@@ -35,21 +35,22 @@ add_library(parquet_util STATIC
  cpu-info.cc
 )
 
-add_library(parquet_test_main
- test_main.cc)
-
-if (APPLE)
- target_link_libraries(parquet_test_main
- gtest
- dl)
- set_target_properties(parquet_test_main
- PROPERTIES LINK_FLAGS "-undefined dynamic_lookup")
-else()
- target_link_libraries(parquet_test_main
- dl
- gtest
- pthread
- )
+if(PARQUET_BUILD_TESTS)
+ add_library(parquet_test_main
+ test_main.cc)
+ if (APPLE)
+ target_link_libraries(parquet_test_main
+ gtest
+ dl)
+ set_target_properties(parquet_test_main
+ PROPERTIES LINK_FLAGS "-undefined dynamic_lookup")
+ else()
+ target_link_libraries(parquet_test_main
+ dl
+ gtest
+ pthread
+ )
+ endif()
 endif()
 
 ADD_PARQUET_TEST(bit-util-test)