amrnbenc: remove global variables
gstcheck is declaring its own buffers glist which ends up overwritten, loks like the code meant to use that already
gcc 10 is also complaining about this, but only on static builds for some reason
FAILED: subprojects/gst-plugins-ugly/tests/check/elements_amrnbenc
/usr/bin/ld: subprojects/gstreamer/libs/gst/check/libgstcheck-1.0.a(gstcheck.c.o):(.bss+0x38): multiple definition of `buffers'; subprojects/gst-plugins-ugly/tests/check/708af1f@@elements_amrnbenc@exe/elements_amrnbenc.c.o:(.bss+0x18): first defined here
collect2: error: ld returned 1 exit status
also remove unused var current_buf
Edited by Jordan Petridіs