The old path was /usr/local/bin, but I think Hans was manually adding the dlls there. If not we can use an ifdef to set this specifically for use with msys2

comment out some dlls for building on Windows with msys2 (we'll see if it turns out we need them later when testing)

remove realpath call and associated code for showing recent files (we get recent files in the native file dialog for free)

fix regression where Pd would eat the first character of a symbol if the symbol contained a double quote.

add another header (not sure if it's supposed to be there, but mingw complains about missing symbols)

Note: this slipped through the cracks because GNU's string.h apparently exposes an object named "index". Compiling under mingw revealed the bug.