mps2-an521: remove the unnecessary -pipe build options

Signed-off-by: guoshichao <[email protected]>

Author: extinguish

boards/arm/mps/mps2-an521/scripts/Make.defs

@@ -32,8 +32,8 @@ CXXFLAGS := $(ARCHCXXFLAGS) $(ARCHOPTIMIZATION) $(ARCHCPUFLAGS) $(ARCHXXINCLUDES
 CXXPICFLAGS = $(ARCHPICFLAGS) $(CXXFLAGS)
 CPPFLAGS := $(ARCHINCLUDES) $(ARCHDEFINES)
 
-CFLAGS   += $(EXTRAFLAGS) -pipe
-CPPFLAGS += $(EXTRAFLAGS) -pipe
+CFLAGS   += $(EXTRAFLAGS)
+CPPFLAGS += $(EXTRAFLAGS)
 
 AFLAGS := $(CFLAGS) -D__ASSEMBLY__