[OpenMP] [OMPD] Fix CMake install command

https://cmake.org/cmake/help/latest/command/install.html
"If a relative path is given it is interpreted relative to the value of the CMAKE_INSTALL_PREFIX variable."

Author: yuanfang-chen

openmp/libompd/gdb-plugin/CMakeLists.txt

@@ -36,5 +36,5 @@ target_link_libraries (ompdModule ${CMAKE_DL_LIBS})
 set_target_properties (ompdModule PROPERTIES PREFIX "")
 set_target_properties (ompdModule PROPERTIES LIBRARY_OUTPUT_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/python-module/ompd/")
 
-install(DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/python-module/ompd DESTINATION ${CMAKE_INSTALL_PREFIX}/share/gdb/python/ PATTERN ompdModule.so PERMISSIONS OWNER_READ WORLD_READ GROUP_READ OWNER_EXECUTE GROUP_EXECUTE WORLD_EXECUTE)
+install(DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/python-module/ompd DESTINATION share/gdb/python/ PATTERN ompdModule.so PERMISSIONS OWNER_READ WORLD_READ GROUP_READ OWNER_EXECUTE GROUP_EXECUTE WORLD_EXECUTE)