PROGMEM issue on Teensy compiler

[Brian Whitman]

If you're seeing ```
In file included from c:\Users\chris\Documents\Arduino\libraries\amy\src\patches.c:5:
c:\Users\chris\Documents\Arduino\libraries\amy\src\patches.c: In function 'patches_load_patch':
c:\Users\chris\Documents\Arduino\libraries\amy\src\patches.h:263:16: error: 'patch_oscs' causes a section type conflict with 'patch_commands'
263 | const uint16_t patch_oscs[256] PROGMEM = {
| ^~~~~~~~~~
In file included from c:\Users\chris\Documents\Arduino\libraries\amy\src\patches.c:5:
c:\Users\chris\Documents\Arduino\libraries\amy\src\patches.h:5:14: note: 'patch_commands' was declared here
5 | const char * patch_commands[256] PROGMEM = {
| ^~~~~~~~~~~~~~

Change patches.h to `static const char * const patch_commands[256] PROGMEM = {` 

I'll try this and commit in after tests. 

[Brian Whitman]

I committed this fix after testing on Teensy. Should not impact any other builds