Allow more PATH tools, expose HOST_STRIP

atree was using the host's strip tool during sdk generation, so expose
the prebuilt for use instead.

`id` was used with a test running minijail0 during the build

`sha1sum` is used by development/build/tools/mk_sdk_repo_xml.sh

`rmdir` was being used to remove some tmp files

Test: m PRODUCT-sdk_arm64-sdk dist sdk_repo
Test: Run other builds through forrest
Change-Id: I49c756a3e9497c0bbd9030754e6aa193a2d989a4
diff --git a/cc/makevars.go b/cc/makevars.go
index bb81dcb..8177aa8 100644
--- a/cc/makevars.go
+++ b/cc/makevars.go
@@ -312,6 +312,7 @@
 
 	ctx.Strict(makePrefix+"CC", gccCmd(toolchain, "gcc"))
 	ctx.Strict(makePrefix+"CXX", gccCmd(toolchain, "g++"))
+	ctx.Strict(makePrefix+"STRIP", gccCmd(toolchain, "strip"))
 
 	if target.Os == android.Darwin {
 		ctx.Strict(makePrefix+"AR", "${config.MacArPath}")
@@ -328,7 +329,6 @@
 	if target.Os.Class == android.Device {
 		ctx.Strict(makePrefix+"OBJCOPY", gccCmd(toolchain, "objcopy"))
 		ctx.Strict(makePrefix+"LD", gccCmd(toolchain, "ld"))
-		ctx.Strict(makePrefix+"STRIP", gccCmd(toolchain, "strip"))
 		ctx.Strict(makePrefix+"GCC_VERSION", toolchain.GccVersion())
 		ctx.Strict(makePrefix+"NDK_GCC_VERSION", toolchain.GccVersion())
 		ctx.Strict(makePrefix+"NDK_TRIPLE", config.NDKTriple(toolchain))