[wangle]fix wangle-config.cmake bug (#5653)

ports/wangle/CONTROL

@@ -1,4 +1,4 @@
 Source: wangle
-Version: 2019.01.07.00
+Version: 2019.01.07.00-1
 Build-Depends: fizz, folly, openssl, gtest, glog, libevent, double-conversion
 Description: Wangle is a framework providing a set of common client/server abstractions for building services in a consistent, modular, and composable way.

ports/wangle/fix-config-cmake.patch

@@ -0,0 +1,19 @@
+diff --git a/wangle/cmake/wangle-config.cmake.in b/wangle/cmake/wangle-config.cmake.in
+index e50af54..a16cdbb 100644
+--- a/wangle/cmake/wangle-config.cmake.in
++++ b/wangle/cmake/wangle-config.cmake.in
+@@ -12,7 +12,13 @@
+ @PACKAGE_INIT@
+ 
+ set_and_check(WANGLE_INCLUDE_DIR "@PACKAGE_INCLUDE_INSTALL_DIR@")
+-set_and_check(WANGLE_CMAKE_DIR "@PACKAGE_CMAKE_INSTALL_DIR@")
++set_and_check(WANGLE_CMAKE_DIR "${PACKAGE_PREFIX_DIR}/share/wangle")
++
++find_package(folly REQUIRED)
++find_package(fizz REQUIRED)
++find_package(glog REQUIRED)
++find_package(threads REQUIRED)
++find_package(libevent REQUIRED)
+ 
+ if (NOT TARGET wangle::wangle)
+   include("${WANGLE_CMAKE_DIR}/wangle-targets.cmake")

ports/wangle/portfile.cmake

@@ -11,6 +11,7 @@ vcpkg_from_github(
     PATCHES
         build.patch
         gflags.patch
+        fix-config-cmake.patch
 )
 
 vcpkg_configure_cmake(
@@ -35,3 +36,4 @@ file(REMOVE_RECURSE
 
 # Handle copyright
 file(INSTALL ${SOURCE_PATH}/LICENSE DESTINATION ${CURRENT_PACKAGES_DIR}/share/wangle RENAME copyright)
+file(INSTALL ${CURRENT_PORT_DIR}/usage DESTINATION ${CURRENT_PACKAGES_DIR}/share/wangle)

ports/wangle/usage

@@ -0,0 +1,5 @@
+The package wangle is compatible with built-in CMake targets:
+
+    find_package(wangle REQUIRED)
+    target_link_libraries(main PRIVATE wangle::wangle)
+    target_include_directories(main PRIVATE ${WANGLE_INCLUDE_DIR})