[Cin] aarch64 patch for guicast

[mat]

When building for aarch64, in the guicast Makefile the aarch64 is
detected, but it then proceeds to produce 32 bit code anyway.
Andrew found that, the attached patch fixes it.

MatN

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Common subdirectories: cinelerra_master/cinelerra-5.1/guicast/images and cinelerra5/cinelerra-5.1/guicast/images
diff cinelerra_master/cinelerra-5.1/guicast/Makefile cinelerra5/cinelerra-5.1/guicast/Makefile
20c20
< BOOTSTRAPFLAGS := -DBOOTSTRAP="\"objcopy -B arm -I binary -O elf64-littlearm\""
---
> BOOTSTRAPFLAGS := -DBOOTSTRAP="\"objcopy -B aarch64 -I binary -O elf64-littleaarch64\""
Common subdirectories: cinelerra_master/cinelerra-5.1/guicast/xfer and cinelerra5/cinelerra-5.1/guicast/xfer