connman: avoid hiding implementation-reserved symbols in version scripts

connman: avoid hiding implementation-reserved symbols in version scripts

This commit adds a patch to ConnMan that modifies the version scripts
(src/connman.ver and vpn/vpn.ver) to avoid hiding implementation-reserved
symbols (such as _IO_stdin_used). Previously, using 'local: *;' in the
version script caused glibc's libio to misdetect the libc version,
resulting in a crash when printing to stdout (e.g., running 'connmand
--help') on PowerPC.

The new patch changes 'local: *;' to 'local: [!_]*;', following the
recommendation in glibc bug 17908
(https://sourceware.org/bugzilla/show_bug.cgi?id=17908). This ensures
that symbols starting with an underscore are not hidden, allowing libio
to correctly detect the libc version and preventing the crash.

Signed-off-by: Peter Tatrai <peter.tatrai.ext@siemens.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>