Fixed compilation with MSVC.

recipes/libpng/recipe.py

@@ -1,14 +1,25 @@
 
+import os
 import re
 from SCons.Script import *
 
+def _build_lib_name(env: Environment) -> str:
+    if os.name == 'posix':
+        return {
+            'debug': 'png16d'
+        }.get(env['BUILD_TYPE'], 'png16')
+    elif os.name == 'nt':
+        return {
+            'debug': 'libpng16_staticd'
+        }.get(env['BUILD_TYPE'], 'libpng16_static')
+    else:
+        raise Exception('libpng is not supported yet on this OS')
+
 def _git_cook(env: Environment, repo: dict) -> dict:
     lib_zlib = env.Cook('zlib')
     checkout_root = repo['checkout_root']
     build_result = env.CMakeProject(checkout_root, dependencies = [lib_zlib])
-    lib_name = {
-        'debug': 'png16d'
-    }.get(env['BUILD_TYPE'], 'png16')
+    lib_name = _build_lib_name(env)
     return {
         'CPPPATH': build_result['CPPPATH'],
         'LIBS': [env.FindLib(lib_name, paths=build_result['LIBPATH'])]