new: port the meson, cmake and autotools template bodies to manifests

data/templates/cmake/manifest.yml

@@ -1,7 +1,9 @@
 ## The `cmake` template: a C/C++ project built with CMake through the
-## debhelper cmake buildsystem. The logic half — the project() probe, the
-## skeleton bodies and the wizard's pkg-config opt-in (appended to
-## Build-Depends) — lives in src/new/templates/cmake.rs.
+## debhelper cmake buildsystem. The skeleton bodies below are static data;
+## the logic half — the project() probe and the wizard's pkg-config
+## opt-in (appended to Build-Depends) — lives in src/new/templates/cmake.rs.
+## hello.c.tpl duplicates the shared C skeleton of the other C/C++
+## template directories (see meson/manifest.yml for why).
 ##
 ## Schema: see src/new/templates/mod.rs.
 
@@ -13,4 +15,8 @@ build_depends:
   - cmake
 architecture: any
 rules_dh_line: "dh $@ --buildsystem=cmake"
-files: []
+files:
+  - path: CMakeLists.txt
+    template: CMakeLists.txt.tpl
+  - path: hello.c
+    template: hello.c.tpl