multimedia: unbreak on aarch64, armv7 and 12.1 i386 after r507589 and r507592

/usr/bin/ld: error: can't create dynamic relocation R_AARCH64_ABS64 against local symbol in readonly segment; recompile object files with -fPIC

defined in libavcodec/aarch64/fft_neon.o
referenced by libavcodec/aarch64/fft_neon.o:(fft_tab_neon)

/usr/bin/ld: error: can't create dynamic relocation R_ARM_ABS32 against symbol: fft4_neon in readonly segment; recompile object files with -fPIC

defined in libavcodec/arm/fft_fixed_neon.o
referenced by libavcodec/arm/fft_fixed_neon.o:(fft_fixed_tab_neon)

/usr/bin/ld: error: can't create dynamic relocation R_ARM_ABS32 against symbol: fft4_neon in readonly segment; recompile object files with -fPIC

defined in libavcodec/arm/fft_fixed_neon.o
referenced by libavcodec/arm/fft_fixed_neon.o:(fft_fixed_tab_neon)