Revert "pcm/Convert: add option to enable the integer-only dsd2pcm implementation"

This reverts commit c84bae739a.  A
configuration option is not necessary, because the PcmConvert
constructor knows already whether integer or floating point is needed.

src/config/Option.hxx

@@ -79,7 +79,6 @@ enum class ConfigOption {
 	DESPOTIFY_USER,
 	DESPOTIFY_PASSWORD,
 	DESPOTIFY_HIGH_BITRATE,
-	DSD2PCM_CONVERTER,
 	MAX
 };
 

src/config/Templates.cxx

@@ -75,7 +75,6 @@ const ConfigTemplate config_param_templates[] = {
 	{ "despotify_user", false, true },
 	{ "despotify_password", false, true },
 	{ "despotify_high_bitrate", false, true },
-	{ "dsd2pcm_converter" },
 };
 
 static constexpr unsigned n_config_param_templates =

src/pcm/Convert.cxx

@@ -19,35 +19,16 @@
 
 #include "Convert.hxx"
 #include "ConfiguredResampler.hxx"
-#include "config/Data.hxx"
 #include "util/ConstBuffer.hxx"
-#include "util/StringAPI.hxx"
 
 #include <stdexcept>
 
 #include <assert.h>
 
-#ifdef ENABLE_DSD
-static bool dsd2pcm_integer = false;
-#endif
-
 void
 pcm_convert_global_init(const ConfigData &config)
 {
 	pcm_resampler_global_init(config);
-
-#ifdef ENABLE_DSD
-	dsd2pcm_integer = config.With(ConfigOption::DSD2PCM_CONVERTER, [](const char *s){
-		if (s == nullptr)
-			return false;
-		else if (StringIsEqual(s, "float"))
-			return false;
-		else if (StringIsEqual(s, "integer"))
-			return true;
-		else
-			throw std::runtime_error("Unrecognized value");
-	});
-#endif
 }
 
 PcmConvert::PcmConvert(const AudioFormat _src_format,