Find protoc before Conan setup

If protoc has been built by both host and build profile this
makes sure CMake finds protoc for the build profile

See discussion in:
conan-io/conan-center-index#4556

CMakeLists.txt

@@ -1,6 +1,10 @@
 cmake_minimum_required(VERSION 2.8.12)
 project(cmake_wrapper)
 
+# Need to find protoc before conan setup to make sure we get the correct
+# one when cross compiling.
+find_program(_gRPC_PROTOBUF_PROTOC_EXECUTABLE protoc)
+
 include(conanbuildinfo.cmake)
 conan_basic_setup()
 

test_package/CMakeLists.txt

@@ -1,6 +1,15 @@
 cmake_minimum_required(VERSION 3.1)
 project(test_package)
 
+# Need to find protoc before conan setup to make sure we get the correct
+# one when cross compiling.
+find_program(_PROTOBUF_PROTOC protoc REQUIRED)
+message("_PROTOBUF_PROTOC ${_PROTOBUF_PROTOC}")
+
+if(NOT _PROTOBUF_PROTOC)
+    message(FATAL_ERROR "${_PROTOBUF_PROTOC} but required!")
+endif()
+
 include(${CMAKE_BINARY_DIR}/conanbuildinfo.cmake)
 conan_basic_setup()
 
@@ -17,14 +26,6 @@ message(STATUS "Using protobuf ${protobuf_VERSION}")
 
 set(_PROTOBUF_LIBPROTOBUF protobuf::libprotobuf)
 
-# Find protoc
-find_program(_PROTOBUF_PROTOC protoc REQUIRED)
-message("_PROTOBUF_PROTOC ${_PROTOBUF_PROTOC}")
-
-if(NOT _PROTOBUF_PROTOC)
-    message(FATAL_ERROR "${_PROTOBUF_PROTOC} but required!")
-endif()
-
 # Find gRPC installation
 find_package(gRPC CONFIG REQUIRED)
 message(STATUS "Using gRPC ${gRPC_VERSION}")