fix(win32): clock_* requires to link winpthread

Glibc since 2.17 have move clock_* from librt to libc so single-thread 
program can use these functions without the overheads associated with 
multi-thread support. But MinGW doesn't.

Signed-off-by: Coelacanthus <uwu@coelacanthus.name>

Author: CoelacanthusHex

utils/CMakeLists.txt

@@ -3,9 +3,15 @@ install(TARGETS lpac-utils LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR})
 target_link_libraries(lpac-utils PRIVATE ${CJSON_LIBRARY} euicc)
 target_compile_options(lpac-utils PRIVATE -Wall -Wextra)
 
-# Only useful on Windows, and will lead to invalid arguments on ld.gold.
 if(WIN32)
+    # Only useful on Windows, and will lead to invalid arguments on ld.gold.
     target_link_options(lpac-utils PRIVATE "LINKER:--export-all-symbols")
+    # FIXME: Glibc since 2.17 have move clock_* from librt to libc so
+    #        single-thread program can use these functions without the
+    #        overheads associated with multi-thread support.
+    #        But MinGW doesn't.
+    find_package(Threads REQUIRED)
+    target_link_libraries(lpac-utils PRIVATE Threads::Threads)
 endif()
 
 target_sources(