Merge pull request #115 from mhx/mhx/fix-install

fix: revert to pre-4.x install path {prefix}/utf8cpp (see #112)

CMakeLists.txt

@@ -1,5 +1,5 @@
 cmake_minimum_required (VERSION 3.5...3.27)
-project (utf8cpp 
+project (utf8cpp
          VERSION 4.0.1
          LANGUAGES CXX
          DESCRIPTION "C++ portable library for working with utf-8 encoding")
@@ -10,7 +10,7 @@ include(GNUInstallDirs)
 
 target_include_directories(utf8cpp INTERFACE
     "$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/source>"
-    $<INSTALL_INTERFACE:include>
+    $<INSTALL_INTERFACE:include/utf8cpp>
 )
 
 include(CMakePackageConfigHelpers)
@@ -44,5 +44,6 @@ install(FILES "${PROJECT_BINARY_DIR}/${PROJECT_NAME}Config.cmake"
               "${PROJECT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake"
         DESTINATION ${CMAKE_INSTALL_DATAROOTDIR}/${PROJECT_NAME}/cmake)
 
-install(FILES ${PROJECT_SOURCE_DIR}/source/utf8.h DESTINATION include)
-install(DIRECTORY ${PROJECT_SOURCE_DIR}/source/utf8 DESTINATION include)
+install(FILES ${PROJECT_SOURCE_DIR}/source/utf8.h DESTINATION include/utf8cpp)
+install(DIRECTORY ${PROJECT_SOURCE_DIR}/source/utf8 DESTINATION
+        include/utf8cpp)