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Move libsamplerate variable declarations earlier

They're needed even when SDL2_mixer is disabled

--- a/src/i_sdlsound.c

+++ b/src/i_sdlsound.c

@@ -41,6 +41,18 @@

 #include "doomtype.h"

+

+int use_libsamplerate = 0;

+

+// Scale factor used when converting libsamplerate floating point numbers

+// to integers. Too high means the sounds can clip; too low means they

+// will be too quiet. This is an amount that should avoid clipping most

+// of the time: with all the Doom IWAD sound effects, at least. If a PWAD

+// is used, clipping might occur.

+

+float libsamplerate_scale = 0.65f;

+

+

 #define LOW_PASS_FILTER

 //#define DEBUG_DUMP_WAVS

 #define NUM_CHANNELS 16

@@ -77,15 +89,6 @@

 static allocated_sound_t *allocated_sounds_tail = NULL;

 static int allocated_sounds_size = 0;

-int use_libsamplerate = 0;

-

-// Scale factor used when converting libsamplerate floating point numbers

-// to integers. Too high means the sounds can clip; too low means they

-// will be too quiet. This is an amount that should avoid clipping most

-// of the time: with all the Doom IWAD sound effects, at least. If a PWAD

-// is used, clipping might occur.

-

-float libsamplerate_scale = 0.65f;

 // Hook a sound into the linked list at the head.