-Wpointer-sign: coff-pe-read.c: treat strings in PE/COFF data as char *.

-Wpointer-sign: coff-pe-read.c: treat strings in PE/COFF data as char *.

A couple places take a pointer to the middle of some raw section
buffer and treat them as strings.  Add casts to char * as appropriate,
fixing -Wpointer-sign warnings.

gdb/
2013-04-19  Pedro Alves  <palves@redhat.com>

	* coff-pe-read.c (read_pe_exported_syms): Handle strings as char.