CubicSDR & dependencies

[Matt Domsch]

I was able to get a clean build, but now (probably due to some other system
updates I finally ran), it segfaults at startup. Tried building with each
of wxGLX3 and wxGLX31 and both builds fail during startup the same way
now.  Is there a known failure in the X  libraries recently calling
LockDisplay()?  There's nothing in the updates-testing repo.

Thread 1 "CubicSDR" received signal SIGSEGV, Segmentation fault.
0x00007ffff2e0aafd in XQueryExtension (dpy=dpy at entry=0x555555a04100,
name=name at entry=0x7ffff03dffa6 "GLX",
major_opcode=major_opcode at entry=0x7fffdca9d0b4,
first_event=first_event at entry=0x7fffffffcde4,
    first_error=first_error at entry=0x7fffdca9d0b8) at QuExt.c:43
43     LockDisplay(dpy);

(gdb) bt
#0  0x00007ffff2e0aafd in XQueryExtension (dpy=dpy at entry=0x555555a04100,
name=name at entry=0x7ffff03dffa6 "GLX",
major_opcode=major_opcode at entry=0x7fffdca9d0b4,
first_event=first_event at entry=0x7fffffffcde4,
first_error=first_error at entry=0x7fffdca9d0b8)
at QuExt.c:43
#1  0x00007ffff03dc522 in InitDisplayInfoEntry (dpy=0x555555a04100) at
libglxmapping.c:645
#2  0x00007ffff03dc522 in __glXLookupDisplay (dpy=<optimized out>,
dpy at entry=0x555555a04100)
at libglxmapping.c:737
#3  0x00007ffff03d8549 in glXQueryVersion (dpy=0x555555a04100,
major=0x7fffffffce90, minor=0x7fffffffce94) at libglx.c:1170
#4  0x00007ffff739b855 in wxGLCanvasX11::GetGLXVersion() () at
./include/wx/utils.h:777
#5  0x00007ffff739be02 in wxGLAttributes::RGBA() (this=0x7fffffffd010) at
./src/unix/glx11.cpp:267
#6  0x00005555555eca91 in AppFrame::AppFrame() (this=0x555555aa0360) at
/usr/src/debug/CubicSDR-0.2.4-1.fc28.x86_64/src/AppFrame.cpp:94
#7  0x00005555555d411e in CubicSDR::OnInit() (this=0x5555559f3d50) at
/usr/src/debug/CubicSDR-0.2.4-1.fc28.x86_64/src/CubicSDR.cpp:366
#8  0x00007ffff605923a in wxEntry(int&, wchar_t**) (argc=<optimized out>,
argv=<optimized out>) at ./include/wx/init.h:109
#9  0x00005555555cb0cc in main(int, char**) (argc=<optimized out>,
argv=<optimized out>) at
/usr/src/debug/CubicSDR-0.2.4-1.fc28.x86_64/src/CubicSDR.cpp:28
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