cmake: Rename 'cppcheck' target to 'kdsme_cppcheck'

So it doesn't clash when used as a submodule of a project that also
defines this target.

For KDAB/GammaRay#1102

Author: iamsergio

.github/workflows/nightly.yml

@@ -65,4 +65,4 @@ jobs:
 
       - name: Run cppcheck
         if: ${{ matrix.config.name == 'clazy' }}
-        run: cmake --build ./build/${{ matrix.config.name }} --preset ${{ matrix.config.name }} --target cppcheck
+        run: cmake --build ./build/${{ matrix.config.name }} --preset ${{ matrix.config.name }} --target kdsme_cppcheck

CMakeLists.txt

@@ -423,7 +423,7 @@ endif()
 feature_summary(WHAT ALL INCLUDE_QUIET_PACKAGES FATAL_ON_MISSING_REQUIRED_PACKAGES)
 
 add_custom_target(
-    cppcheck
+    kdsme_cppcheck
     USES_TERMINAL
     WORKING_DIRECTORY ${PROJECT_BINARY_DIR}
     COMMENT "run cppcheck on source files"