[libc] Add strlen to library entrypoints.

Reviewers: sivachandra, abrachet

Reviewed By: abrachet

Subscribers: mgorny, tschuett, libc-commits

Tags: #libc-project

Differential Revision: https://reviews.llvm.org/D79016

GitOrigin-RevId: 6b01964271b92e9986bcf9412254dcf65559bba8
diff --git a/lib/CMakeLists.txt b/lib/CMakeLists.txt
index 5b31ad2..561ab38 100644
--- a/lib/CMakeLists.txt
+++ b/lib/CMakeLists.txt
@@ -26,6 +26,7 @@
     libc.src.string.memcpy
     libc.src.string.strcpy
     libc.src.string.strcat
+    libc.src.string.strlen
 
     # sys/mman.h entrypoints
     libc.src.sys.mman.mmap