Use dir instead of ls on Windows

[mniak]

No description provided.

[danomatika]

Another approach would be to use a Makefile variable:

# command defaults ala CC=... etc
LS=ls

# main platform detection section...
ifeq ($(system), Windows)
    ...
    LS=dir
...

# store path to Pd API m_pd.h if it is found
 ifdef PDINCLUDEDIR
   mpdh := $(shell $(LS) "$(PDINCLUDEDIR)/m_pd.h")

...

[umlaeute]

as mentioned in the original issue (and to add more opinions here):

i figure, pd-lib-builder targets MinGW/MSYS environments (on Windows), where MSYS should provide ls (so the problem really seems to be an edge-case: many people are using pd-lib-builder on Windows without a problem).

however, i wonder why we can't use a Make-builtin instead of using external programs, e.g. a simple $(wildcard "$(PDINCLUDEDIR)/m_pd.h") (on all platforms).

[danomatika]

If there is a built-in function, it would be the best option as the cross platform handling would be done by make itself.