- Remove patches:
- config-guess-sub-update.patch
- popt-secure-getenv.patch
run autoreconf instead .
- popt-libc-updates.patch replaces popt-secure-getenv.patch
* test for secure_getenv instead of __secure_getenv
* update configure.ac so it can be regenerated with modern
autotools.
* Internal symbols are already hidden with a linker script,
improve that by hidding symbols with the compiler too.
* use strerror_r instead of strerror in the library.

- popt wants __secure_getenv at configure time, but This
function is no longer available as of glibc 2.17.
test for secure_getenv() instead (popt-secure-getenv.patch) (forwarded request 155365 from elvigia)