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_rain_dance.s

@@ -97,7 +97,7 @@ se_m_rain_dance_1:
 	.byte		        1*se_m_rain_dance_mvl/mxv
 	.byte		PAN   , c_v+4
 	.byte	W06
-	.byte		EOT   
+	.byte		EOT
 	.byte	FINE
 
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