aports/mariadb: remove glibc dep on ppc

Remove dependency on glibc by using gcc builtin function and no glibc
wrappers.

Currently there are no surrogates in musl for:

  __ppc_get_timebase()
  __ppc_set_ppr_low()
  __ppc_set_ppr_med()

however glibc __ppc_get_timebase() is just a wrapper for GCC builtin
__builtin_get_timebase() available since GCC 4.8 [1], so assuming that
aports on ppc64le will never be built using GCC < 4.8 we can just
switch directly to the GCC builtin function.

Also __ppc_set_ppr_{low,med}() are not available on musl but both
are simple glibc wrappers on a single asm instruction, hence there
is no harm in using asm directly instead. Actually, using asm
directly was the first solution adopted in MariaDB [2].

[1] https://goo.gl/jxLV6O
[2] https://goo.gl/9bjuVC

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