Another round of GCC fixes (#3115)

* Fix remaining <string> -> <cstring> for GCC compilation (#3114 follow-up)

MWerks' <string> header transitively includes C string functions
(memcpy, strlen, strcmp, etc.), but GCC/Clang's <string> is the C++
std::string header. These files all use C string functions and should
include <cstring> instead.

* Use std::isnan instead of isnan for GCC compilation

GCC's <cmath> places isnan in the std namespace. Using the unqualified
isnan fails to compile with GCC/Clang.

* Fix cCcD_Src types: s32 -> u32 for bitmask fields

cCcD_SrcObjCommonBase::mSPrm, cCcD_SrcObjTg::mType, and
cCcD_SrcObjAt::mType are used as bitmasks (SetType/SetSPrm take u32,
MskType/MskSPrm use u32, values like 0xFFFFFFFF are common in
aggregate inits). Change from s32 to u32 to match usage.

Also fix AT_TYPE_WOLF_ATTACK/AT_TYPE_UNK to use unsigned literals,
and remove now-unnecessary (s32) casts on hex literals in collision
source data.

* Mark dummy() functions as static to avoid multiple definition errors

These decomp artifact functions have the same name and signature across
TUs, causing linker errors when building as a single binary.

src/d/actor/d_a_obj_kbacket.cpp

@@ -22,7 +22,7 @@ const daObj_KBacket_HIOParam daObj_KBacket_Param_c::m = {
 };
 
 static const dCcD_SrcGObjInf l_ccDObjData = {
-    {0x0, {{0x0, 0x0, 0x0}, {(s32)0xd8fbfdff, 0x0}, 0x79}}, // mObj
+    {0x0, {{0x0, 0x0, 0x0}, {0xd8fbfdff, 0x0}, 0x79}}, // mObj
     {dCcD_SE_NONE, 0x0, 0x0, 0x0, 0x0}, // mGObjAt
     {dCcD_SE_STONE, 0x0, 0x0, 0x0, 0x0}, // mGObjTg
     {0x0}, // mGObjCo