[libc] Fix missing errno include in fuzzer (#144132)

The printf parser uses errno for setting up the %m conversion. It was
presumably getting this include indirectly until a recent change. This
patch adds a direct dependency to fix it.

Author: michaelrj-google

libc/fuzzing/stdio/CMakeLists.txt

@@ -4,6 +4,7 @@ add_libc_fuzzer(
     printf_parser_fuzz.cpp
   DEPENDS
     libc.src.stdio.printf_core.parser
+    libc.src.errno.errno # needed for the strerror conversion
 )
 
 add_libc_fuzzer(