treewide: get rid of C math function usage

Boost does not seem to offer an overload for lrint.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

src/decoder/Bridge.cxx

@@ -37,9 +37,9 @@
 #include "util/StringBuffer.hxx"
 
 #include <cassert>
+#include <cmath>
 
 #include <string.h>
-#include <math.h>
 
 DecoderBridge::DecoderBridge(DecoderControl &_dc, bool _initial_seek_pending,
 			     std::unique_ptr<Tag> _tag) noexcept
@@ -611,7 +611,7 @@ DecoderBridge::SubmitReplayGain(const ReplayGainInfo *new_replay_gain_info) noex
 			const auto &tuple = new_replay_gain_info->Get(rgm);
 			const auto scale =
 				tuple.CalculateScale(dc.replay_gain_config);
-			dc.replay_gain_db = 20.0 * log10f(scale);
+			dc.replay_gain_db = 20.0 * std::log10(scale);
 		}
 
 		replay_gain_info = *new_replay_gain_info;

src/decoder/plugins/MpcdecDecoderPlugin.cxx

@@ -25,6 +25,7 @@
 #include "tag/Handler.hxx"
 #include "util/Domain.hxx"
 #include "util/Clamp.hxx"
+#include "util/Math.hxx"
 #include "util/ScopeExit.hxx"
 #include "Log.hxx"
 
@@ -32,8 +33,6 @@
 
 #include <iterator>
 
-#include <math.h>
-
 struct mpc_decoder_data {
 	InputStream &is;
 	DecoderClient *client;