Added 48khz support to Windows and Linux

zsnes/src/cfgload.asm

@@ -645,6 +645,7 @@ db '',13,10
 db '; Sound Sampling Rate',13,10
 db ';   0 =  8,000 Hz, 1 = 11,025 Hz, 2 = 22,050 Hz',13,10
 db ';   3 = 44,100 Hz, 4 = 16,000 Hz, 5 = 32,000 Hz',13,10
+db ';   6 = 48,000 Hz',13,10
 db '',13,10                               
 db 'SoundRate = %W',13,10
 db '',13,10

zsnes/src/gui/gui.asm

@@ -1528,10 +1528,6 @@ SECTION .text
 NEWSYM StartGUI
 ;    cmp byte[OSPort],1
 ;    jbe .dosport
-%ifndef __MSDOS__
-    mov byte[sampratenext+3],0
-%endif
-
     cmp byte[TripBufAvail],0
     jne .notexttb
     mov byte[Triplebufen],0