fix protozero cmake config failure on linux if clang-tidy is installed

Summary:
addressed #39
change based on mapbox/protozero@4904953

Reviewed By: enpe

Differential Revision: D63415372

fbshipit-source-id: 1fe789c117c2327c820fb6e279f5dca44e834fb1

build/cmake/third-party/protozero/protozero.patch

@@ -1,5 +1,5 @@
 diff --git a/CMakeLists.txt b/CMakeLists.txt
-index b975d49..40a6b0b 100644
+index b975d49..e925f53 100644
 --- a/CMakeLists.txt
 +++ b/CMakeLists.txt
 @@ -1,3 +1,5 @@
@@ -17,7 +17,7 @@ index b975d49..40a6b0b 100644
 
  set(PROTOZERO_DATA_VIEW "" CACHE STRING "Type used for protozero::data_view")
  if(NOT PROTOZERO_DATA_VIEW STREQUAL "")
-@@ -68,11 +70,11 @@ if(CLANG_TIDY AND PROTOBUF_FOUND)
+@@ -68,13 +70,15 @@ if(CLANG_TIDY AND PROTOBUF_FOUND)
      add_custom_target(clang-tidy
          ${CLANG_TIDY}
          -p ${CMAKE_BINARY_DIR}
@@ -32,9 +32,14 @@ index b975d49..40a6b0b 100644
 +        ${CMAKE_CURRENT_LIST_DIR}/test/unit/*.cpp
 +        ${CMAKE_CURRENT_LIST_DIR}/tools/*.cpp
      )
-     add_dependencies(clang-tidy writer_tests)
+-    add_dependencies(clang-tidy writer_tests)
++	if(BUILD_TESTING)
++	    add_dependencies(clang-tidy writer_tests)
++	endif()
  else()
-@@ -94,12 +96,12 @@ if(CPPCHECK)
+     message(STATUS "Looking for clang-tidy - not found")
+     message(STATUS "  Build target 'clang-tidy' will not be available.")
+@@ -94,12 +98,12 @@ if(CPPCHECK)
      add_custom_target(cppcheck
          ${CPPCHECK}
          -Uassert --std=c++11 --enable=all