Backport debian's fix-armel patch

Running Ardour on 32 bit ARM without hardware floating point
unit may be considered civil disobedience. But we understand that
it is incumbent on the young to disobey :)

libs/ardour/globals.cc

@@ -926,6 +926,9 @@ ARDOUR::setup_fpu ()
 		    : "=r"(cw)::"memory");
 	}
 
+#elif defined(__ARMEL__)
+	/* no FTZ instructions on that platform */
+#warning you do not want to compile Arodur on armel.
 #elif defined(__arm__)
 	/* http://infocenter.arm.com/help/topic/com.arm.doc.dui0068b/BCFHFBGA.html
 	 * bit 24: flush-to-zero */