cppcheck: Make less annoying

Force checking all #ifdef paths, disable StlAlgorithm
suggestion

Removes a lot of borderline useless spew.

[ci skip]

build_tools/cppcheck.sh

@@ -3,4 +3,5 @@
 cppcheck --enable=all --std=posix --quiet \
          --suppressions-list=build_tools/cppcheck.suppressions \
          --rule-file=build_tools/cppcheck.rules \
+         --force \
          ./src/

build_tools/cppcheck.suppressions

@@ -10,3 +10,6 @@ varFuncNullUB
 unmatchedSuppression
 // Suppress this one because it reports assert(condition && "message"), which we use all over the place
 incorrectStringBooleanError
+
+// This is of very little use and pops up *everywhere*.
+useStlAlgorithm