Draft: v6.4.3.p4.6 support

[bl4ckb0ne]

Requires etnaviv/galcore_headers#3

Compiles but segfaults in libGAL.so

Program received signal SIGSEGV, Segmentation fault.
0x0000fffff71efeb8 in gcoOS_GetTLS () from /usr/lib/libGAL.so
(gdb) bt
#0  0x0000fffff71efeb8 in gcoOS_GetTLS () from /usr/lib/libGAL.so
#1  0x0000fffff7097540 in gcoHAL_SetHardwareType () from /usr/lib/libGAL.so
#2  0x0000fffff7252da4 in ?? () from /usr/lib/libgbm_viv.so
#3  0x0000fffff7253010 in gbm_viv_create_buffers () from /usr/lib/libgbm_viv.so
#4  0x0000fffff72532ac in ?? () from /usr/lib/libgbm_viv.so
#5  0x0000000000405640 in init_surface (modifier=<optimized out>, modifier@entry=0) at ../common.c:96
#6  0x0000000000405c1c in init_gbm (drm_fd=<optimized out>, w=1920, h=1080, format=format@entry=875713112, modifier=modifier@entry=0, 
    surfaceless=surfaceless@entry=false) at ../common.c:139
#7  0x000000000040bf60 in main (argc=<optimized out>, argv=<optimized out>) at ../kmscube.c:229

Builds on #4

[austriancoder]

The change looks fine - have something equal locally. I also needed some mmap/munmap changes. The commit message could be improved.

But overall we can land it.

[bl4ckb0ne]

I haven't worked out all of the details in gc_abi,h, I might copy it from the imx8 one and add the new things.