comms/gqrx: Turn off ASLR

Disable ASLR to work around the following crash:

Program terminated with signal SIGSEGV, Segmentation fault.
Address not mapped to object.
--Type <RET> for more, q to quit, c to continue without paging--
0 0x000000082e9feecf in volk_32f_x2_dot_prod_32f_a_avx2_fma (result=0x85185d7e0, input=0x906a9ab80, taps=0x8927eaa00, num_points=289) at /usr/ports/devel/volk/work/volk-2.5.1/kernels/volk/volk_32f_x2_dot_prod_32f.h:833
833 dotProduct += ((*aPtr++) * (*bPtr++));
[Current thread is 1 (LWP 126875)]
(gdb) bt
0 0x000000082e9feecf in volk_32f_x2_dot_prod_32f_a_avx2_fma (result=0x85185d7e0, input=0x906a9ab80, taps=0x8927eaa00, num_points=289) at /usr/ports/devel/volk/work/volk-2.5.1/kernels/volk/volk_32f_x2_dot_prod_32f.h:833
1 0x000000082e776b17 in __volk_32f_x2_dot_prod_32f_a (result=0x85185d7e0, input=0x906a9ab80, taps=0x8927eaa00, num_points=289) at /usr/ports/devel/volk/work/.build/lib/volk.c:5336
2 0x0000000825fe0b83 in gr::filter::kernel::fir_filter<float, float, float>::filterN(float*, float const*, unsigned long) () from /usr/local/lib/libgnuradio-filter.so.3.8.4