feat: add ARM64 support

[bweigel]

[mnai-prout-james]

@bweigel - thanks for this, even though still in draft.

I got this to work locally via clang instead of gss compiler, which appears to be the recommendation from the tesseract team too.

Edits were:

RUN yum -y install clang gcc-c++ make autoconf aclocal automake libtool \

and:

RUN echo "/opt/leptonica/lib" > /etc/ld.so.conf.d/leptonica.conf RUN echo sudo ldconfig

I also stripped out CXXFLAGS on the tesseract build

It took an age to build, but that could be my laptop. Either way - I've just published to my AWS account as a layer and working just fine, thanks!