gdb/

gdb/
	* solib-svr4.c (read_program_header): Support type == -1 to read
	all program headers.
	(read_program_headers_from_bfd): New function.
	(svr4_static_exec_displacement): Remove and move the comment ...
	(svr4_exec_displacement): ... here.  Remove variable found.  New
	variable displacement.  Check also DYNAMIC.  Verify DISPLACEMENT
	alignment for ELF targets.  Compare target vs. exec_bfd PHDRs for ELF
	targets using read_program_headers_from_bfd.  Remove the call of
	svr4_static_exec_displacement.