-Wmaybe-uninitialized when compiling on Raspberry Pi 3

[LizardLad]

In the file src/e_lgamma_r.c gcc thinks that nadj is uninitialised. This can be fixed by changing line 208 to double t, y, z, nadj = 0, p, p1, p2, p3, q, r, w;

[ViralBShah]

It is not being used without initializing, so safe to ignore. Or submit a PR if you don't want to see the warning. :-)