makefiles: Support delay imports for PE builds.

tools/winebuild/import.c

@@ -1386,7 +1386,8 @@ static void build_windows_import_lib( DLLSPEC *spec )
             m_flag = NULL;
             break;
     }
-    strarray_add( &args, "-k", "-l", output_file_name, "-d", def_file, NULL );
+    strarray_add( &args, "-k", strendswith( output_file_name, ".delay.a" ) ? "-y" : "-l",
+                  output_file_name, "-d", def_file, NULL );
     if (m_flag)
         strarray_add( &args, "-m", m_flag, as_flags, NULL );
     spawn( args );

tools/winebuild/winebuild.man.in

@@ -48,7 +48,8 @@ Build a .def file from a spec file. The .spec file is specified via the
 .TP
 .BI \--implib
 Build a .a import library from a spec file. The .spec file is
-specified via the \fB-E\fR option.
+specified via the \fB-E\fR option. If the output library name ends
+in .delay.a, a delayed import library is built.
 .TP
 .B \--resources
 Generate a .o file containing all the input resources. This is useful