Add gettid for L2 in musl_src.gni

Signed-off-by: Nzhuoli <pengzhuoli@huawei.com>

musl_src.gni

@@ -372,6 +372,7 @@ musl_src_file = [
   "src/linux/flock.c",
   "src/linux/getdents.c",
   "src/linux/getrandom.c",
+  "src/linux/gettid.c",
   "src/linux/inotify.c",
   "src/linux/ioperm.c",
   "src/linux/iopl.c",
@@ -1662,6 +1663,7 @@ musl_inc_sys_files = [
   "include/sys/acct.h",
   "include/sys/auxv.h",
   "include/sys/cachectl.h",
+  "include/sys/capability.h",
   "include/sys/dir.h",
   "include/sys/epoll.h",
   "include/sys/errno.h",