contrib: freetype: build with PIC
I got a Linux x86-64 build complaining it was not built with PIC.
/usr/bin/ld: /root/build/contrib/x86_64-linux-gnu/lib/libfreetype.a(truetype.c.o): warning: relocation against `TT_RunIns' in read-only section `.text'
/usr/bin/ld: /root/build/contrib/x86_64-linux-gnu/lib/libfreetype.a(truetype.c.o): relocation R_X86_64_PC32 against symbol `TT_RunIns' can not be used when making a shared object; recompile with -fPIC