Portability fixes and cleanups

Move Mac OS X IOKit/DirectHW availability checks in the Makefile from
compiler check to pciutils check.

Print the compiler error messages for feature detection.

Add DOS libpci in the Makefile includes only if a PCI-based programmer
was requested.

Restrict mmap usage in ich_descriptors_tool to Unix style systems.

Build ich_descriptors_tool with the correct .exe extension on
DOS/Windows.

Build ich_descriptors_tool by default on x86. (Patch by Stefan Tauner)

Print the Windows version instead of "unknown machine" on Windows.

Don't #define our own __DARWIN__, use the standard OS X detection
method.

Update the README.

Add more generated files to svn:ignore

Corresponding to flashrom svn r1567.

Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
diff --git a/physmap.c b/physmap.c
index eca6760..5aa9874 100644
--- a/physmap.c
+++ b/physmap.c
@@ -129,7 +129,7 @@
 void cleanup_cpu_msr(void)
 {
 }
-#elif defined(__DARWIN__)
+#elif defined(__MACH__) && defined(__APPLE__)
 
 #define MEM_DEV "DirectHW"
 
@@ -468,7 +468,7 @@
 
 #else
 
-#ifdef __DARWIN__
+#if defined(__MACH__) && defined(__APPLE__)
 int setup_cpu_msr(int cpu)
 {
 	// Always succeed for now