Fix finding c-ares in package mode with CMake

The next release of c-ares will install a CMake package (when built
using CMake), but it will be called "c-ares", not "CARES".

CMakeLists.txt

@@ -150,11 +150,11 @@ if("${gRPC_CARES_PROVIDER}" STREQUAL "module")
     message(WARNING "gRPC_CARES_PROVIDER is \"module\" but CARES_ROOT_DIR is wrong")
   endif()
 elseif("${gRPC_CARES_PROVIDER}" STREQUAL "package")
-  find_package(CARES)
-  if(TARGET CARES::CARES)
-    set(_gRPC_CARES_LIBRARIES CARES::CARES)
+  find_package(c-ares CONFIG)
+  if(TARGET c-ares::cares)
+    set(_gRPC_CARES_LIBRARIES c-ares::cares)
   endif()
-  set(_gRPC_FIND_CARES "if(NOT CARES_FOUND)\n  find_package(CARES)\nendif()")
+  set(_gRPC_FIND_CARES "if(NOT c-ares_FOUND)\n  find_package(c-ares CONFIG)\nendif()")
 endif()
 
 if("${gRPC_PROTOBUF_PROVIDER}" STREQUAL "module")

templates/CMakeLists.txt.template

@@ -195,11 +195,11 @@
       message(WARNING "gRPC_CARES_PROVIDER is \"module\" but CARES_ROOT_DIR is wrong")
     endif()
   elseif("<%text>${gRPC_CARES_PROVIDER}</%text>" STREQUAL "package")
-    find_package(CARES)
-    if(TARGET CARES::CARES)
-      set(_gRPC_CARES_LIBRARIES CARES::CARES)
+    find_package(c-ares CONFIG)
+    if(TARGET c-ares::cares)
+      set(_gRPC_CARES_LIBRARIES c-ares::cares)
     endif()
-    set(_gRPC_FIND_CARES "if(NOT CARES_FOUND)\n  find_package(CARES)\nendif()")
+    set(_gRPC_FIND_CARES "if(NOT c-ares_FOUND)\n  find_package(c-ares CONFIG)\nendif()")
   endif()
 
   if("<%text>${gRPC_PROTOBUF_PROVIDER}</%text>" STREQUAL "module")

tools/cmake/gRPCConfig.cmake.in

@@ -2,6 +2,7 @@
 @_gRPC_FIND_ZLIB@
 @_gRPC_FIND_PROTOBUF@
 @_gRPC_FIND_SSL@
+@_gRPC_FIND_CARES@
 
 # Targets
 include(${CMAKE_CURRENT_LIST_DIR}/gRPCTargets.cmake)