Added check for stdbool.h header and forcing its use (#159)

When compiling YARA without Python bindings, stdbool.h is actually used
if it can be used. However Python bindings completely ignore it resulting
in YARA defining its own bool type with sizeof(bool) == sizeof(int).
However before [#1377](VirusTotal/yara#1377), this
can result in different compilation units using different sizes of
bool type and chaos ensues.

setup.py

@@ -14,9 +14,9 @@
 # limitations under the License.
 #
 
+from setuptools import setup, Command, Extension
 from distutils.command.build import build
 from distutils.command.build_ext import build_ext
-from setuptools import setup, Command, Extension
 from codecs import open
 
 import distutils.errors
@@ -87,6 +87,23 @@ def has_function(function_name, libraries=None):
   return result
 
 
+def has_header(header_name):
+  compiler = distutils.ccompiler.new_compiler()
+  with muted(sys.stdout, sys.stderr):
+    with tempfile.NamedTemporaryFile(mode='w', prefix=header_name, delete=False, suffix='.c') as f:
+      f.write("""
+#include <{}>
+
+int main() {{ return 0; }}
+      """.format(header_name))
+      f.close()
+      try:
+        compiler.compile([f.name])
+      except distutils.errors.CompileError:
+        return False
+  return True
+
+
 class BuildCommand(build):
 
   user_options = build.user_options + OPTIONS
@@ -221,6 +238,9 @@ class BuildExtCommand(build_ext):
       module.define_macros.append(('USE_NO_PROC', '1'))
       module.extra_compile_args.append('-std=c99')
 
+    if has_header('stdbool.h'):
+      module.define_macros.append(('HAVE_STDBOOL_H', '1'))
+
     if has_function('memmem'):
       module.define_macros.append(('HAVE_MEMMEM', '1'))
     if has_function('strlcpy'):
@@ -240,6 +260,9 @@ class BuildExtCommand(build_ext):
           module.define_macros.append(('HASH_MODULE', '1'))
           module.define_macros.append(('HAVE_LIBCRYPTO', '1'))
           module.libraries.append('crypto')
+        elif building_for_windows:
+          module.define_macros.append(('HASH_MODULE', '1'))
+          module.define_macros.append(('HAVE_WINCRYPT_H', '1'))
         else:
           exclusions.append('yara/libyara/modules/hash/hash.c')