Fix public include directories for blosc2 targets:

The target_include_directories interface is given in blosc2 subdirectory as ${CMAKE_CURRENT_SOURCE_DIR},
which makes this directory automatically included when linking the blosc2 target in CMake. However,
the blosc2 include directory is in the parent ../include directory, so the correct way to include it could be
${CMAKE_CURRENT_SOURCE_DIR}/../include . Moreover, ${CMAKE_CURRENT_SOURCE_DIR} exposes internal headers
instead of the public headers, so we may want to turn the original include directory into a private include.

blosc/CMakeLists.txt

@@ -32,8 +32,9 @@ if(BUILD_SHARED)
         SOVERSION 4  # Change this when an ABI change happens
     )
     target_compile_definitions(blosc2_shared PUBLIC BLOSC_SHARED_LIBRARY)
+    target_include_directories(blosc2_shared PRIVATE ${CMAKE_CURRENT_SOURCE_DIR})
     target_include_directories(blosc2_shared PUBLIC
-        $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>
+        $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/../include>
         $<INSTALL_INTERFACE:include>)
 endif()
 if(BUILD_STATIC)
@@ -53,8 +54,9 @@ if(BUILD_STATIC)
     if(MSVC OR MINGW)
         set_target_properties(blosc2_static PROPERTIES PREFIX lib)
     endif()
+    target_include_directories(blosc2_static PRIVATE ${CMAKE_CURRENT_SOURCE_DIR})
     target_include_directories(blosc2_static PUBLIC
-        $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>
+        $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/../include>
         $<INSTALL_INTERFACE:include>)
 endif()
 # When the option has been selected to compile the test suite,