build: correct ordering of include (apple#608)

Correct the ordering that @bnbarham pointed out post-commit.  Ensure
that we adjust the `CMAKE_MODULE_PATH` prior to the use of `include`
which will reference local modules.

CMakeLists.txt

@@ -6,9 +6,6 @@ project(swift-argument-parser
 option(BUILD_EXAMPLES "Build Example Programs" TRUE)
 option(BUILD_SHARED_LIBS "Build shared libraries by default" YES)
 
-include(CTest)
-include(SwiftSupport)
-
 list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake/modules)
 
 set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
@@ -17,6 +14,9 @@ set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
 
 set(CMAKE_Swift_MODULE_DIRECTORY ${CMAKE_BINARY_DIR}/swift)
 
+include(CTest)
+include(SwiftSupport)
+
 find_package(dispatch CONFIG)
 find_package(Foundation CONFIG)
 find_package(XCTest CONFIG)