Clean up math functions

- Remove checking for standard functions from the build system
- Prefix all invocations with std::
- Replace suffixed functions with unprefixed versions
- Include <cmath> in all files that use it and remove the global include

e.g. floorf(x) -> std::floor(x)

src/ModelTypes.cpp

@@ -9,6 +9,7 @@
 #include "RageLog.h"
 #include "RageDisplay.h"
 
+#include <cmath>
 #include <numeric>
 
 #define MS_MAX_NAME	32
@@ -71,7 +72,7 @@ void AnimatedTexture::Load( const RString &sTexOrIniPath )
 			RString sFileName;
 			float fDelay = 0;
 			if( pAnimatedTexture->GetAttrValue( sFileKey, sFileName ) &&
-				pAnimatedTexture->GetAttrValue( sDelayKey, fDelay ) ) 
+				pAnimatedTexture->GetAttrValue( sDelayKey, fDelay ) )
 			{
 				RString sTranslateXKey = ssprintf( "TranslateX%04d", i );
 				RString sTranslateYKey = ssprintf( "TranslateY%04d", i );
@@ -85,7 +86,7 @@ void AnimatedTexture::Load( const RString &sTexOrIniPath )
 				ID.bStretch = true;
 				ID.bHotPinkColorKey = true;
 				ID.bMipMaps = true;	// use mipmaps in Models
-				AnimatedTextureState state( 
+				AnimatedTextureState state(
 					TEXTUREMAN->LoadTexture( ID ),
 					fDelay,
 					vOffset
@@ -155,7 +156,7 @@ float AnimatedTexture::GetAnimationLengthSeconds() const
 
 void AnimatedTexture::SetSecondsIntoAnimation( float fSeconds )
 {
-	fSeconds = fmodf( fSeconds, GetAnimationLengthSeconds() );
+	fSeconds = std::fmod( fSeconds, GetAnimationLengthSeconds() );
 
 	m_iCurState = 0;
 	for( unsigned i=0; i<vFrames.size(); i++ )
@@ -353,7 +354,7 @@ bool msAnimation::LoadMilkshapeAsciiBones( RString sAniName, RString sPath )
 /*
  * (c) 2003-2004 Chris Danford
  * All rights reserved.
- * 
+ *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the
  * "Software"), to deal in the Software without restriction, including
@@ -363,7 +364,7 @@ bool msAnimation::LoadMilkshapeAsciiBones( RString sAniName, RString sPath )
  * copyright notice(s) and this permission notice appear in all copies of
  * the Software and that both the above copyright notice(s) and this
  * permission notice appear in supporting documentation.
- * 
+ *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF