[Cleanup] Add missing #include. Remove useless ones.

This CL is the result of running include-what-you-use tool on part
of the code base (audio target and dependencies) plus manual fixes.

bug: webrtc:8311
Change-Id: I277d281ce943c3ecc1bd45fd8d83055931743604
Reviewed-on: https://webrtc-review.googlesource.com/c/106280
Commit-Queue: Yves Gerey <yvesg@google.com>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Patrik Höglund <phoglund@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#25311}
diff --git a/rtc_base/string_to_number.cc b/rtc_base/string_to_number.cc
index 9201242..634652b 100644
--- a/rtc_base/string_to_number.cc
+++ b/rtc_base/string_to_number.cc
@@ -10,6 +10,7 @@
 
 #include "rtc_base/string_to_number.h"
 
+#include <ctype.h>
 #include <cerrno>
 #include <cstdlib>