versioner: Update libc.map.txt to match annotations
This commit removes several symbol versions (API 14 and 15) from
`libc.map.txt` because we no longer support NDK with those API levels.
This also matches the versioner annotations in the header files.
This commit also annotates twalk() with __INTRODUCED_IN(21). It was
accidentally removed in aosp/1157510.
Test: source development/vndk/tools/header-checker/android/envsetup.sh && \
source build/envsetup.sh && \
lunch aosp_arm64-userdebug && \
m versioner && \
./bionic/tools/versioner/run_tests.py
Change-Id: I211fe5b7b1b66793d5e76a8676f9d18825f96b5e
diff --git a/libc/include/search.h b/libc/include/search.h
index 7a75404..7c4989a 100644
--- a/libc/include/search.h
+++ b/libc/include/search.h
@@ -214,6 +214,6 @@
* [twalk(3)](http://man7.org/linux/man-pages/man3/twalk.3.html) calls
* `__visitor` on every node in the tree.
*/
-void twalk(const void* __root, void (*__visitor)(const void*, VISIT, int));
+void twalk(const void* __root, void (*__visitor)(const void*, VISIT, int)) __INTRODUCED_IN(21);
__END_DECLS