Fix building without sandboxing (#769)

Since 466c32c70f any changes you made
while testing rules_foreign_cc, or changes to those rules, would not
invalidate the CMakeCache.txt and lead to build issues. It wasn't the
case before that because new temp dirs were used each time.

foreign_cc/built_tools/private/built_tools_framework.bzl

@@ -63,6 +63,9 @@ def built_tool_rule_impl(ctx, script_lines, out_dir, mnemonic):
         "export EXT_BUILD_ROOT=##pwd##",
         "export INSTALLDIR=$$EXT_BUILD_ROOT$$/{}".format(out_dir.path),
         "export BUILD_TMPDIR=$$INSTALLDIR$$.build_tmpdir",
+        "##rm_rf## $$INSTALLDIR$$",
+        "##rm_rf## $$BUILD_TMPDIR$$",
+        "##mkdirs## $$INSTALLDIR$$",
         "##mkdirs## $$BUILD_TMPDIR$$",
         "##copy_dir_contents_to_dir## ./{} $$BUILD_TMPDIR$$".format(root),
         "cd $$BUILD_TMPDIR$$",

foreign_cc/private/framework.bzl

@@ -396,6 +396,8 @@ def cc_external_rule_impl(ctx, attrs):
         "##script_prelude##",
     ] + env_prelude + [
         "##path## $$EXT_BUILD_ROOT$$",
+        "##rm_rf## $$BUILD_TMPDIR$$",
+        "##rm_rf## $$EXT_BUILD_DEPS$$",
         "##mkdirs## $$INSTALLDIR$$",
         "##mkdirs## $$BUILD_TMPDIR$$",
         "##mkdirs## $$EXT_BUILD_DEPS$$",

foreign_cc/private/framework/toolchains/commands.bzl

@@ -203,6 +203,10 @@ PLATFORM_COMMANDS = {
             "Replace the target symlink with resolved file it points to if `file` is a symlink"
         ),
     ),
+    "rm_rf": _command_info(
+        arguments = [_argument_info(name = "path", data_type = type(""), doc = "Path to directory")],
+        doc = "Recursively removes the given path",
+    ),
     "script_extension": _command_info(
         arguments = [],
         doc = "Return the extension for the current set of commands (`.sh` for bash, `.ps1` for powershell)",

foreign_cc/private/framework/toolchains/linux_commands.bzl

@@ -41,6 +41,9 @@ def disable_tracing():
 def mkdirs(path):
     return "mkdir -p " + path
 
+def rm_rf(path):
+    return "rm -rf " + path
+
 def if_else(condition, if_text, else_text):
     return """
 if [ {condition} ]; then

foreign_cc/private/framework/toolchains/macos_commands.bzl

@@ -41,6 +41,9 @@ def disable_tracing():
 def mkdirs(path):
     return "mkdir -p " + path
 
+def rm_rf(path):
+    return "rm -rf " + path
+
 def if_else(condition, if_text, else_text):
     return """\
 if [ {condition} ]; then

foreign_cc/private/framework/toolchains/windows_commands.bzl

@@ -41,6 +41,9 @@ def disable_tracing():
 def mkdirs(path):
     return "mkdir -p " + path
 
+def rm_rf(path):
+    return "rm -rf " + path
+
 def if_else(condition, if_text, else_text):
     return """\
 if [ {condition} ]; then