scons: Move MinGW flags from crossmingw.py to gallium.py

So that they are used by native MinGW compilers too.

scons/crossmingw.py

@@ -225,14 +225,6 @@ def generate(env):
     # default in recent gcc versions
     env.AppendUnique(CCFLAGS = ['-gstabs'])
 
-    env.AppendUnique(CPPDEFINES = [('__MSVCRT_VERSION__', '0x0700')])
-    #env.AppendUnique(LIBS = ['iberty'])
-    env.AppendUnique(SHLINKFLAGS = ['-Wl,--enable-stdcall-fixup'])
-    #env.AppendUnique(SHLINKFLAGS = ['-Wl,--kill-at'])
-
-    # Avoid depending on gcc runtime DLLs
-    env.AppendUnique(LINKFLAGS = ['-static-libgcc'])
-
     env.AddMethod(compile_without_gstabs, 'compile_without_gstabs')
 
 def exists(env):

scons/gallium.py

@@ -279,6 +279,8 @@ def generate(env):
             ('_WIN32_WINNT', '0x0601'),
             ('WINVER', '0x0601'),
         ]
+        if gcc:
+            cppdefines += [('__MSVCRT_VERSION__', '0x0700')]
         if msvc and env['toolchain'] != 'winddk':
             cppdefines += [
                 'VC_EXTRALEAN',
@@ -532,6 +534,12 @@ def generate(env):
             pass
         else:
             env['_LIBFLAGS'] = '-Wl,--start-group ' + env['_LIBFLAGS'] + ' -Wl,--end-group'
+        if env['platform'] == 'windows':
+            # Avoid depending on gcc runtime DLLs
+            linkflags += ['-static-libgcc']
+            # Handle the @xx symbol munging of DLL exports
+            shlinkflags += ['-Wl,--enable-stdcall-fixup']
+            #shlinkflags += ['-Wl,--kill-at']
     if msvc:
         if env['build'] == 'release':
             # enable Link-time Code Generation