Make includedir in pkgconfig point to the iniparser directory

This reverts commit 4b1e33a
which was the result of a misunderstanding regarding issue #165. The
issue was not about the actual header location but, as its title already
states: "includedir should point to the iniparser directory".

Author: lmoellendorf

CMakeLists.txt

@@ -68,7 +68,7 @@ foreach(TARGET_TYPE ${TARGET_TYPES})
     EXPORT ${TARGETS_EXPORT_NAME}
     LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
     ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
-    PUBLIC_HEADER DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
+    PUBLIC_HEADER DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/${PROJECT_NAME})
 
   # build directory package config
   export(

cmake/pc.in

@@ -1,6 +1,6 @@
 prefix=@CMAKE_INSTALL_PREFIX@
 exec_prefix=${prefix}
-includedir=${prefix}/@CMAKE_INSTALL_INCLUDEDIR@
+includedir=${prefix}/@CMAKE_INSTALL_INCLUDEDIR@/@PROJECT_NAME@
 libdir=${exec_prefix}/@CMAKE_INSTALL_LIBDIR@
 
 Name: @PROJECT_NAME@