Do not install header files which are copied during building steps

Installing them updates time-stamps on the files, and incremental
rebuild is always rebuilding, even though no files are changed.

With this change repeated invocation of `python scripts/build_locally.py`
is effectively a no-op.

Author: oleksandr-pavlyk

CMakeLists.txt

@@ -1,7 +1,7 @@
 cmake_minimum_required(VERSION 3.21...3.27 FATAL_ERROR)
 
 project(dpctl
-    VERSION 0.15
+    VERSION 0.17
     LANGUAGES CXX
     DESCRIPTION "Python interface for XPU programming"
 )
@@ -47,11 +47,6 @@ endif()
 
 add_subdirectory(libsyclinterface)
 
-file(GLOB _dpctl_capi_headers dpctl/apis/include/*.h*)
-install(FILES ${_dpctl_capi_headers}
-    DESTINATION dpctl/include
-)
-
 # Define CMAKE_INSTALL_xxx: LIBDIR, INCLUDEDIR
 include(GNUInstallDirs)
 

libsyclinterface/CMakeLists.txt

@@ -280,7 +280,7 @@ set_target_properties(DPCTLSyclInterface
 
 if (SKBUILD)
     set(_lib_destination dpctl)
-    set(_include_destination dpctl/include/syclinterface)
+    set(_include_destination ${CMAKE_INSTALL_PREFIX}/unused)
 else()
     set(_lib_destination ${CMAKE_INSTALL_PREFIX}/lib)
     set(_include_destination ${CMAKE_INSTALL_PREFIX}/include)