Let mk_hyb_file.py replace ßSS in .chr.txt files with ßẞ.
Let mk_hyb_file.py replace ßSS in .chr.txt files with ßẞ.

Here these mappings are used to convert from uppercase to lowercase,
and mk_hyb_file.py doesn't handle multi-character uppercase sequences.
Therefore, in case the sequence ßSS is encountered in a .chr.txt,
replace it internally with ßẞ.

Test: make -j
Change-Id: I8f678aad9298784f70645c453ec07da5bf43cb66

jason-simmons/flutter_engine,aam/engine,cdotstout/sky_engine,cdotstout/sky_engine,jamesr/sky_engine,jason-simmons/flutter_engine,Hixie/sky_engine,devoncarew/engine,jamesr/sky_engine,aam/engine,devoncarew/engine,flutter/engine,krisgiesing/sky_engine,rmacnak-google/engine,mikejurka/engine,Hixie/sky_engine,rmacnak-google/engine,Hixie/sky_engine,cdotstout/sky_engine,flutter/engine,cdotstout/sky_engine,devoncarew/sky_engine,jason-simmons/flutter_engine,jamesr/sky_engine,jamesr/flutter_engine,devoncarew/engine,flutter/engine,aam/engine,jamesr/flutter_engine,jason-simmons/sky_engine,devoncarew/engine,devoncarew/sky_engine,mikejurka/engine,devoncarew/sky_engine,mikejurka/engine,chinmaygarde/sky_engine,aam/engine,jason-simmons/sky_engine,Hixie/sky_engine,krisgiesing/sky_engine,rmacnak-google/engine,Hixie/sky_engine,tvolkert/engine,mikejurka/engine,tvolkert/engine,Hixie/sky_engine,chinmaygarde/flutter_engine,tvolkert/engine,mikejurka/engine,tvolkert/engine,jamesr/flutter_engine,jamesr/flutter_engine,jamesr/sky_engine,chinmaygarde/flutter_engine,jason-simmons/sky_engine,chinmaygarde/sky_engine,rmacnak-google/engine,devoncarew/sky_engine,flutter/engine,cdotstout/sky_engine,jason-simmons/sky_engine,cdotstout/sky_engine,devoncarew/engine,jamesr/sky_engine,krisgiesing/sky_engine,jamesr/flutter_engine,rmacnak-google/engine,chinmaygarde/sky_engine,chinmaygarde/flutter_engine,flutter/engine,Hixie/sky_engine,chinmaygarde/flutter_engine,chinmaygarde/flutter_engine,rmacnak-google/engine,krisgiesing/sky_engine,jason-simmons/sky_engine,jamesr/sky_engine,jamesr/flutter_engine,jamesr/flutter_engine,tvolkert/engine,devoncarew/engine,jamesr/flutter_engine,jamesr/sky_engine,aam/engine,flutter/engine,chinmaygarde/sky_engine,jason-simmons/flutter_engine,chinmaygarde/sky_engine,krisgiesing/sky_engine,krisgiesing/sky_engine,tvolkert/engine,flutter/engine,aam/engine,mikejurka/engine,flutter/engine,devoncarew/sky_engine,jason-simmons/sky_engine,jason-simmons/flutter_engine,chinmaygarde/flutter_engine,jason-simmons/sky_engine,devoncarew/sky_engine,chinmaygarde/flutter_engine,jason-simmons/flutter_engine,chinmaygarde/sky_engine,aam/engine,tvolkert/engine,mikejurka/engine,jamesr/flutter_engine,Hixie/sky_engine,krisgiesing/sky_engine,mikejurka/engine,aam/engine,devoncarew/sky_engine,chinmaygarde/sky_engine,jason-simmons/flutter_engine,mikejurka/engine,jason-simmons/flutter_engine,rmacnak-google/engine,cdotstout/sky_engine,devoncarew/engine