7041156: gcc 4.6 doesn't recognise -export-dynamic option

Summary: Since -export-dynamic is a linker option, the correct way to pass it is -Xlinker -export-dynamic
Reviewed-by: dsamersoff, dholmes
Contributed-by: omajid@redhat.com

make/linux/makefiles/gcc.make

@@ -205,7 +205,7 @@ SONAMEFLAG = -Xlinker -soname=SONAME
 SHARED_FLAG = -shared
 
 # Keep symbols even they are not used
-AOUT_FLAGS += -export-dynamic
+AOUT_FLAGS += -Xlinker -export-dynamic
 
 #------------------------------------------------------------------------
 # Debug flags