don't install external component

Index: rts/lib/fastgltf/CMakeLists.txt
--- rts/lib/fastgltf/CMakeLists.txt.orig
+++ rts/lib/fastgltf/CMakeLists.txt
@@ -141,38 +141,6 @@ elseif(FASTGLTF_ENABLE_CPP_MODULES)
     message(WARNING "FASTGLTF_ENABLE_CPP_MODULES is ON but compiler does not support them")
 endif()
 
-write_basic_package_version_file(
-    "${PROJECT_BINARY_DIR}/fastgltfConfigVersion.cmake"
-    VERSION ${PACKAGE_VERSION}
-    COMPATIBILITY SameMajorVersion
-)
-
-install(
-    FILES ${FASTGLTF_HEADERS}
-    DESTINATION include/fastgltf
-)
-
-install(FILES
-    "${CMAKE_CURRENT_BINARY_DIR}/fastgltfConfigVersion.cmake"
-    DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/fastgltf
-)
-
-install(
-    TARGETS fastgltf
-    EXPORT fastgltf-targets
-    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
-    ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
-    RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
-    INCLUDES DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
-)
-
-install(
-    EXPORT fastgltf-targets
-    FILE fastgltfConfig.cmake
-    NAMESPACE fastgltf::
-    DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/fastgltf
-)
-
 if (FASTGLTF_ENABLE_TESTS OR FASTGLTF_ENABLE_EXAMPLES)
     # This is required so that Catch2 compiles with C++17, enabling various features we use in tests.
     if (NOT DEFINED CMAKE_CXX_STANDARD OR CMAKE_CXX_STANDARD STREQUAL "" OR CMAKE_CXX_STANDARD LESS 17)
