Add cmake build infrastructure.

Not default nor even distributed in the .tar.gz, the cmake build allows for
loadable yasm plugins by building libyasm as a shared library.
Example plugins are in the plugins/ directory, and may be loaded into a
cmake-built yasm using the -N command line option (non-cmake builds will
not have this option).

Tested only on Linux so far, but should be relatively painless to port to
Windows thanks to the use of cmake rather than libtool to create shared
libraries.

The only modification to the main source tree is some conditional-compiled
additions to yasm.c.

svn path=/trunk/yasm/; revision=2098

libyasm-stdint.h.cmake

@@ -0,0 +1,20 @@
+#cmakedefine HAVE_STDINT_H
+
+#ifdef HAVE_STDINT_H
+#include <stdint.h>
+#elif defined(_MSC_VER)
+
+#ifndef _UINTPTR_T_DEFINED
+#ifdef _WIN64
+#include <vadefs.h>
+#else
+typedef unsigned long uintptr_t;
+#endif
+#define _UINTPTR_T_DEFINED
+#endif
+
+#else
+typedef unsigned long uintptr_t;
+#endif
+
+#undef HAVE_STDINT_H