RFR: 8286850: [macos] Add support for signing user provided app image [v2]

[Michael Hall]

Fwiw, I was going to take a look at this but my build failed.

=== Output from failing command(s) repeated here ===
* For target support_native_java.desktop_liblcms_cmstypes.o:
/Users/mjh/Documents/GitHub/jdk/src/java.desktop/share/native/liblcms/cmstypes.c:3441:132: error: parameter 'SizeOfTag' set but not used [-Werror,-Wunused-but-set-parameter]
void *Type_ProfileSequenceId_Read(struct _cms_typehandler_struct* self, cmsIOHANDLER* io, cmsUInt32Number* nItems, cmsUInt32Number SizeOfTag)
                                                                                                                                   ^
/Users/mjh/Documents/GitHub/jdk/src/java.desktop/share/native/liblcms/cmstypes.c:5137:125: error: parameter 'SizeOfTag' set but not used [-Werror,-Wunused-but-set-parameter]
void *Type_Dictionary_Read(struct _cms_typehandler_struct* self, cmsIOHANDLER* io, cmsUInt32Number* nItems, cmsUInt32Number SizeOfTag)
                                                                                                                            ^
2 errors generated.


OS/X 12.4

2.4 GHz Quad-Core Intel Core i5

If I should post that somewhere else let me know.