package/eudev: fix build with musl + libselinux

Add a patch to disable mallinfo statistics with musl toolchains
which doesn't have struct mallinfo.

Fixes:
selinux-util.c: In function ‘mac_selinux_init’:
selinux-util.c:70:25: error: storage size of ‘before_mallinfo’ isn’t known
         struct mallinfo before_mallinfo, after_mallinfo;

Add a second patch for strndupa() which is a GNU extension.

Fixes:
./.libs/libudev-core.a(selinux-util.o): In function `mac_selinux_bind':
selinux-util.c:(.text+0xd94): undefined reference to `strndupa'
collect2: error: ld returned 1 exit status

Signed-off-by: Romain Naour <romain.naour@openwide.fr>
Cc: Clayton Shotwell <clshotwe@rockwellcollins.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>