Add CMake 3.20.0 and 3.19.7 (#587)

* Add CMake 3.20.0 and 3.19.7

* Update docs

docs/README.md

@@ -455,7 +455,7 @@ Call this function from the WORKSPACE file to initialize rules_foreign_cc     de
 | :------------- | :------------- | :------------- |
 | <a id="rules_foreign_cc_dependencies-native_tools_toolchains"></a>native_tools_toolchains |  pass the toolchains for toolchain types     '@rules_foreign_cc//toolchains:cmake_toolchain' and     '@rules_foreign_cc//toolchains:ninja_toolchain' with the needed platform constraints.     If you do not pass anything, registered default toolchains will be selected (see below).   |  <code>[]</code> |
 | <a id="rules_foreign_cc_dependencies-register_default_tools"></a>register_default_tools |  If True, the cmake and ninja toolchains, calling corresponding     preinstalled binaries by name (cmake, ninja) will be registered after     'native_tools_toolchains' without any platform constraints. The default is True.   |  <code>True</code> |
-| <a id="rules_foreign_cc_dependencies-cmake_version"></a>cmake_version |  The target version of the cmake toolchain if <code>register_default_tools</code>     or <code>register_built_tools</code> is set to <code>True</code>.   |  <code>"3.19.6"</code> |
+| <a id="rules_foreign_cc_dependencies-cmake_version"></a>cmake_version |  The target version of the cmake toolchain if <code>register_default_tools</code>     or <code>register_built_tools</code> is set to <code>True</code>.   |  <code>"3.20.0"</code> |
 | <a id="rules_foreign_cc_dependencies-make_version"></a>make_version |  The target version of the default make toolchain if <code>register_built_tools</code>     is set to <code>True</code>.   |  <code>"4.3"</code> |
 | <a id="rules_foreign_cc_dependencies-ninja_version"></a>ninja_version |  The target version of the ninja toolchain if <code>register_default_tools</code>     or <code>register_built_tools</code> is set to <code>True</code>.   |  <code>"1.10.2"</code> |
 | <a id="rules_foreign_cc_dependencies-register_preinstalled_tools"></a>register_preinstalled_tools |  If true, toolchains will be registered for the native built tools     installed on the exec host   |  <code>True</code> |

foreign_cc/repositories.bzl

@@ -12,7 +12,7 @@ load("//toolchains:toolchains.bzl", "built_toolchains", "prebuilt_toolchains", "
 def rules_foreign_cc_dependencies(
         native_tools_toolchains = [],
         register_default_tools = True,
-        cmake_version = "3.19.6",
+        cmake_version = "3.20.0",
         make_version = "4.3",
         ninja_version = "1.10.2",
         register_preinstalled_tools = True,

toolchains/built_toolchains.bzl

@@ -25,7 +25,33 @@ def _cmake_toolchain(version):
     native.register_toolchains(
         "@rules_foreign_cc//toolchains:built_cmake_toolchain",
     )
-    if version == "3.19.6":
+    if "3.20.0" == version:
+        maybe(
+            http_archive,
+            name = "cmake_src",
+            build_file_content = _ALL_CONTENT,
+            sha256 = "9c06b2ddf7c337e31d8201f6ebcd3bba86a9a033976a9aee207fe0c6971f4755",
+            strip_prefix = "cmake-3.20.0",
+            urls = [
+                "https://github.com/Kitware/CMake/releases/download/v3.20.0/cmake-3.20.0.tar.gz",
+            ],
+        )
+        return
+
+    if "3.19.7" == version:
+        maybe(
+            http_archive,
+            name = "cmake_src",
+            build_file_content = _ALL_CONTENT,
+            sha256 = "58a15f0d56a0afccc3cc5371234fce73fcc6c8f9dbd775d898e510b83175588e",
+            strip_prefix = "cmake-3.19.7",
+            urls = [
+                "https://github.com/Kitware/CMake/releases/download/v3.19.7/cmake-3.19.7.tar.gz",
+            ],
+        )
+        return
+
+    if "3.19.6" == version:
         maybe(
             http_archive,
             name = "cmake_src",