REMOVE common.cmakev6.0remove_common_cmake

This repo literally started with common.cmake. However, I think that in
this day and age, it is, to put it mildly, outdated. Feature by feature:

* The C++ standard is better defined on a per-project basis, and it's
  very easy. Frankly, I'm surprised GCC still (as of March '26) defaults
  to something pre-11 (or at least I think it does).
* The warning options are, again, very easy to do on a per-project
  basis, and perhaps they should be defined there.
* The Windows-only defines (NOMINMAX, etc.) are, again, very easy to
  define on the project level, and don't warrant a separate file.
* The static runtime thing is more tricky. I use static runtime linking
  on Windows only, basically. And since about 3.15, it supports
  CMAKE_MSVC_RUNTIME_LIBRARY, which can set up the linking without my
  help. I don't care about the older versions enough to keep maintenance.
* Symbol stripping is better done when calling `cmake --install --strip`
  in modern CMake version. Otherwise, it's a simple compilation flag for
  Release builds.
* Installing PDBs does require some trickery though. It's simple enough:
  you just call install() with $<TARGET_PDB_FILE> or whatever it's
  called.

1 files changed, 0 insertions, 16 deletions

diff --git a/README.md b/README.md
index ad14966..ff8ada6 100644
--- a/README.md
+++ b/README.md
@@ -90,22 +90,6 @@ Build (and optionally, install) a CMake project.
 
 Pass the `--help` flag to view detailed usage information.
 
-### common.cmake
-
-Use in a project by putting
-
-    include(path/to/common.cmake)
-
-in CMakeLists.txt.
-
-This file aids in quick-and-dirty development by
-
-* linking everything (including the runtime) statically by default,
-* setting some useful compilation options (enables warnings, defines common
-Windows-specific macros, strips debug symbols in release builds, etc.).
-
-Everything is enabled by default (use the `CC_*` CMake options to opt out).
-
 Tools
 -----