misc fixes
misc fixes

- Tell the compiler to go in C99 mode

- Prefer PIC code only

Signed-off-by: Cristian Rodríguez <f7c6aba9f660d4e7bf290efe49aa2eece49b63ce@opensuse.org>

gbenson/libi8x,icke2063/libabcc,gbenson/libi8x,LeSpocky/libabc,LeSpocky/libabc,icke2063/libabcc