Removed trailing spaces in the most relevant files

Command used for the job:
egrep -rl ' $' --include *.c --include *.h --include  *.s --include  *.inc --include  *.txt *  | xargs sed -i 's/\s\+$//g'

Credits to Grant Murphy from Stack Overflow.

sound/songs/se_m_icy_wind.s

@@ -30,7 +30,7 @@ se_m_icy_wind_1:
 	.byte		N01   , Ds4 , v112
 	.byte	W01
 	.byte		PAN   , c_v+0
-	.byte		N01   , Bn4 
+	.byte		N01   , Bn4
 	.byte	W03
 	.byte	FINE
 
@@ -43,13 +43,13 @@ se_m_icy_wind_2:
 	.byte		PAN   , c_v+0
 	.byte		N01   , Dn4 , v040
 	.byte	W04
-	.byte		        Bn3 
+	.byte		        Bn3
 	.byte	W02
 	.byte		PAN   , c_v-7
 	.byte	W02
 	.byte		        c_v+9
 	.byte	W01
-	.byte		N01   , Dn4 
+	.byte		N01   , Dn4
 	.byte	W01
 	.byte		PAN   , c_v-7
 	.byte	W02