ccache: update to 4.1

Upstream switched to building with CMake. Adjust accordingly.

Reapplied patch as upstream changed the file format.

Added HOST_BUILD_PARALLEL for faster compilation.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

tools/ccache/patches/100-honour-copts.patch

@@ -1,10 +1,10 @@
---- a/src/ccache.c
-+++ b/src/ccache.c
-@@ -2277,6 +2277,7 @@ calculate_object_hash(struct args *args,
- 			"CPLUS_INCLUDE_PATH",
- 			"OBJC_INCLUDE_PATH",
- 			"OBJCPLUS_INCLUDE_PATH", // clang
-+			"GCC_HONOUR_COPTS",
- 			NULL
- 		};
- 		for (const char **p = envvars; *p; ++p) {
+--- a/src/ccache.cpp
++++ b/src/ccache.cpp
+@@ -1654,6 +1654,7 @@ calculate_result_name(Context& ctx,
+                              "CPLUS_INCLUDE_PATH",
+                              "OBJC_INCLUDE_PATH",
+                              "OBJCPLUS_INCLUDE_PATH", // clang
++                             "GCC_HONOUR_COPTS",
+                              nullptr};
+     for (const char** p = envvars; *p; ++p) {
+       const char* v = getenv(*p);