remove support for *.rc files

We're now packaging llvm-windres (aosp/1870074) which can be used as a
substitute for GNU binutils' windres, but we've also removed the last
consumer of .rc files in aosp/1867048 (external/mdnsresponder/).

In the worst case, we can bring back support for .rc files but instead
process them with llvm-windres.

Bug: 203794880
Test: lunch aosp_cf_x86_64_phone-userdebug && m
Change-Id: I30a873537e004b46a87191a932d076a89463c873

cc/builder.go

@@ -238,14 +238,6 @@ var (
 		},
 		"asFlags")
 
-	// Rule to invoke windres, for interaction with Windows resources.
-	windres = pctx.AndroidStaticRule("windres",
-		blueprint.RuleParams{
-			Command:     "$windresCmd $flags -I$$(dirname $in) -i $in -o $out --preprocessor \"${config.ClangBin}/clang -E -xc-header -DRC_INVOKED\"",
-			CommandDeps: []string{"$windresCmd"},
-		},
-		"windresCmd", "flags")
-
 	_ = pctx.SourcePathVariable("sAbiDumper", "prebuilts/clang-tools/${config.HostPrebuiltTag}/bin/header-abi-dumper")
 
 	// -w has been added since header-abi-dumper does not need to produce any sort of diagnostic information.
@@ -577,20 +569,6 @@ func transformSourceToObj(ctx android.ModuleContext, subdir string, srcFiles, no
 				},
 			})
 			continue
-		case ".rc":
-			ctx.Build(pctx, android.BuildParams{
-				Rule:        windres,
-				Description: "windres " + srcFile.Rel(),
-				Output:      objFile,
-				Input:       srcFile,
-				Implicits:   cFlagsDeps,
-				OrderOnly:   pathDeps,
-				Args: map[string]string{
-					"windresCmd": mingwCmd(flags.toolchain, "windres"),
-					"flags":      shareFlags("flags", flags.toolchain.WindresFlags()),
-				},
-			})
-			continue
 		case ".o":
 			objFiles[i] = srcFile
 			continue

cc/config/toolchain.go

@@ -95,8 +95,6 @@ type Toolchain interface {
 
 	YasmFlags() string
 
-	WindresFlags() string
-
 	Is64Bit() bool
 
 	ShlibSuffix() string
@@ -169,10 +167,6 @@ func (toolchainBase) YasmFlags() string {
 	return ""
 }
 
-func (toolchainBase) WindresFlags() string {
-	return ""
-}
-
 func (toolchainBase) LibclangRuntimeLibraryArch() string {
 	return ""
 }

cc/config/x86_windows_host.go

@@ -188,14 +188,6 @@ func (t *toolchainWindows) IncludeFlags() string {
 	return "${config.WindowsIncludeFlags}"
 }
 
-func (t *toolchainWindowsX86) WindresFlags() string {
-	return "-F pe-i386"
-}
-
-func (t *toolchainWindowsX8664) WindresFlags() string {
-	return "-F pe-x86-64"
-}
-
 func (t *toolchainWindowsX86) ClangTriple() string {
 	return "i686-windows-gnu"
 }