This splits out the core part into a new function
pe_section_table_find().
pe_header_find_section() takes a PeHeader as input, while
pe_section_table_find() just takes the section table and its size.
This renames pe_read_section_data() to pe_read_section_data_by_name()
and makes pe_read_section_data() a bit more low-level: it takes a header
table entry directly, instead of searching it first by name.
Lennart Poettering