physmem: Fix compilation errors on MSVC

[Bruno Haible]

A testdir for module 'physmem' produces compilation errors with MSVC 14:
- It includes <unistd.h>, but this header file does not exist in MSVC.
- It uses the undefined type 'WINBOOL'.

This patch fixes it.


2020-05-30  Bruno Haible  <br...@clisp.org>

        physmem: Fix compilation errors on MSVC.
        * lib/physmem.c (PFN_MS_EX): Use BOOL, not WINBOOL.
        * modules/physmem (Depends-on): Add unistd.

diff --git a/lib/physmem.c b/lib/physmem.c
index 76813a4..6f0c5ef 100644
--- a/lib/physmem.c
+++ b/lib/physmem.c
@@ -81,7 +81,7 @@ typedef struct
   DWORDLONG ullAvailVirtual;
   DWORDLONG ullAvailExtendedVirtual;
 } lMEMORYSTATUSEX;
-typedef WINBOOL (WINAPI *PFN_MS_EX) (lMEMORYSTATUSEX*);
+typedef BOOL (WINAPI *PFN_MS_EX) (lMEMORYSTATUSEX*);
 
 #endif
 
diff --git a/modules/physmem b/modules/physmem
index 9644522..2cb7e7f 100644
--- a/modules/physmem
+++ b/modules/physmem
@@ -7,6 +7,7 @@ lib/physmem.c
 m4/physmem.m4
 
 Depends-on:
+unistd
 
 configure.ac:
 gl_PHYSMEM