Compile error on latest toolchain. Don't know what it means. Might be waiting on the new toolchain for vanilla 213 since it's not released yet. You seem to have fewer problems with the not-bleeding-edge compiler.
Version line: gcc version 9.2.0 (Rev1, Built by MSYS2 project)
Here's where it barfed:
Compiling src/mame/drivers/aci_borisdpl.cpp...
internal error in mingw32_gt_pch_use_address, at config/i386/host-mingw32.c:186: MapViewOfFileEx: Attempt to access invalid address.
<command-line>: fatal error: had to relocate PCH
compilation terminated.
make[2]: *** [adc.make:314: ../../../../mingw-gcc/obj/x64/Release/src/mame/drivers/super6.o] Error 1
internal error in mingw32_gt_pch_use_address, at config/i386/host-mingw32.c:186: MapViewOfFileEx: Attempt to access invalid address.
<command-line>: fatal error: had to relocate PCH
compilation terminated.
make[1]: *** [Makefile:421: adc] Error 2
make[1]: *** Waiting for unfinished jobs....
make[2]: *** [act.make:345: ../../../../mingw-gcc/obj/x64/Release/src/mame/drivers/apricot.o] Error 1
make[2]: *** Waiting for unfinished jobs....
Compiling src/mame/drivers/apricotf.cpp...
Compiling src/mame/drivers/manohman.cpp...
Compiling src/mame/drivers/aci_ggm.cpp...
Compiling src/mame/drivers/accomm.cpp...
Compiling src/mame/drivers/stellafr.cpp...
Compiling src/mame/drivers/acrnsys.cpp...
make[1]: *** [Makefile:418: act] Error 2
Compiling src/mame/drivers/aci_prodigy.cpp...
internal error in mingw32_gt_pch_use_address, at config/i386/host-mingw32.c:186: MapViewOfFileEx: Attempt to access invalid address.
<command-line>: fatal error: had to relocate PCH
compilation terminated.
make[2]: *** [aci.make:334: ../../../../mingw-gcc/obj/x64/Release/src/mame/drivers/aci_ggm.o] Error 1
make[2]: *** Waiting for unfinished jobs....
Compiling src/mame/drivers/acrnsys1.cpp...
Archiving libadp.a...
internal error in mingw32_gt_pch_use_address, at config/i386/host-mingw32.c:186: MapViewOfFileEx: Attempt to access invalid address.
<command-line>: fatal error: had to relocate PCH
compilation terminated.
make[2]: *** [acorn.make:438: ../../../../mingw-gcc/obj/x64/Release/src/mame/drivers/acrnsys.o] Error 1
make[2]: *** Waiting for unfinished jobs....
make[1]: *** [Makefile:415: aci] Error 2
make[1]: *** [Makefile:103: acorn] Error 2
make: *** [makefile:1061: windows_x64] Error 2