gifsicle: fix TEST by adding cmd:perl to BUILD_PREREQUIRES.

Also patch test/testie to replace "/usr/bin/perl" by "/bin/perl".

media-gfx/gifsicle/gifsicle-1.88.recipe

@@ -27,11 +27,17 @@ BUILD_REQUIRES="
 	haiku_devel
 	"
 BUILD_PREREQUIRES="
+	cmd:awk
 	cmd:gcc
 	cmd:make
-	cmd:awk
+	cmd:perl
 	"
 
+PATCH()
+{
+	sed -i -e '1 s|/usr\(/bin/perl\)|\1|' test/testie
+}
+
 BUILD()
 {
 	runConfigure ./configure