PR273, SOM size -A

PR273, SOM size -A

The SOM backend creates BFD sections for "spaces", and "sub-spaces".
"sub-spaces" are what we normally think of as a section, "spaces"
aggregate "sub-spaces".  Thus it does not really make sense to include
"spaces" for size -A since that would double count total size.

It so happens that real sections ought to have at least one of the
ALLOC and HAS_CONTENTS flags set, so this patch excludes "spaces" but
excluding BFD sections with no flags set.

	PR 273
	* size.c (sysv_internal_sizer, sysv_internal_printer): Exclude
	sections with no flag bits set.
	* testsuite/binutils-all/size.exp: Allow $CODE$ as a text section.