Some relevant lines provide clues to its meaning:
+# Build libwallet if monero folder doesnt exist
There are also some 32bit specific lines:
+# Build monerod
+# win32 need to build daemon manually with msys2 toolchain
Does the above mean that soon the GUI will not require manually compiling monerod from source (with a win32 exception)? Is this pull request is indicative of something very late in the (pre-release) development lifecycle?