Bug#767138: fftw3: runtime detection of NEON is perhaps broken

[Edmund Grimley Evans]

> really_have_neon is probably inlined into fftwf_have_simd_neon, because 

The assembler code you quoted looks like the translation of
X(have_simd_neon) with "bl 0xa9f84" being the call to
really_have_neon().