fix: occupied point check radius calculated incorrectly

fix: occupied point calculation takes too much cpu power
fix: buffer overrun in messaging processing
fix: running bots on hlds 3111e (cs 1.5) on linux*
build: added back correct ldscript for gcc and clang

* for some reason only gcc-compiled binaries working on centos5.8 and hlds 3.1.1.1e. clang binaries crashing immediately, so if you want to run bot on ancient os and/or hlds you need to recompile with gcc, as default linux binaries built with clang.

ldscript.lds

@@ -0,0 +1,10 @@
+YAPB_ABI_1.0 {
+   global: 
+      Meta_*;
+      GiveFnptrsToDll;
+      GetBotAPI;
+      GetEntityAPI;
+      GetNewDLLFunctions;
+   local: 
+      *;
+};