Revert "ieee754: disable test for muen (fix #3305)"

This reverts commit 918b9a9fa4.

The Muen debug console buffer was increased by the recent update, which
alleviates the issue with many log messages as in the ieee754 test.

repos/libports/run/ieee754.run

@@ -2,10 +2,8 @@
 # Raspberry PI 1 needs "undef exc" handling emulation code in the kernel
 # for ieee754 full-compliant support
 #
-# Muen has a problem with the long output needed by this test
-#
-if {[have_spec rpi] || [have_spec muen]} {
-	puts "Run script does not support this platform"
+if {[have_spec rpi]} {
+	puts "Run script does not support Raspberry Pi 1"
 	exit 0
 }