Fix some pedantic compiler stuff and a warning off-by-1

Signed-off-by: bones_was_here <bones_was_here@xonotic.au>

builddate.c

@@ -20,12 +20,12 @@ const char *buildstring =
 //	STRINGIFY(__clang_major__)
 //	"."
 //	STRINGIFY(__clang_minor__)
-#elifdef __GNUC__
+#elif defined(__GNUC__)
 	" GCC "
 //	STRINGIFY(__GNUC__)
 //	"."
 //	STRINGIFY(__GNUC_MINOR__)
-#elifdef _MSC_VER
+#elif defined(_MSC_VER)
 	" MSC "
 //	STRINGIFY(_MSC_VER)
 #endif

common.c

@@ -1036,7 +1036,7 @@ int dpvsnprintf (char *buffer, size_t buffersize, const char *format, va_list ar
 			if (result > 0)
 			{
 				msg[sizeof(msg) - 1] = '\n'; // may have been lost in truncation
-				Sys_Print(msg, min((size_t)result, sizeof(msg)));
+				Sys_Print(msg, min((size_t)result, sizeof(msg) - 1));
 			}
 		}
 		return -1;

sys_shared.c

@@ -1011,16 +1011,16 @@ static void Sys_HandleCrash(int sig)
 	sys.outfd = fileno(stderr); // not async-signal-safe :(
 #ifndef WIN32
 	fcntl(sys.outfd, F_SETFL, fcntl(sys.outfd, F_GETFL, 0) & ~O_NONBLOCK);
-	Sys_Print("\n\n\e[1;37;41m    Engine Crash: ", 30);
+	Sys_Print("\n\n\x1B[1;37;41m    Engine Crash: ", 30);
 	Sys_Print(sigdesc, strlen(sigdesc));
-	Sys_Print("    \e[m\n", 8);
+	Sys_Print("    \x1B[m\n", 8);
   #if __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 1
 	// the first two addresses will be in this function and in signal() in libc
 	backtrace_symbols_fd(stackframes + 2, framecount - 2, sys.outfd);
   #endif
-	Sys_Print("\e[1m", 4);
+	Sys_Print("\x1B[1m", 4);
 	Sys_Print(engineversion, strlen(engineversion));
-	Sys_Print("\e[m\n", 4);
+	Sys_Print("\x1B[m\n", 4);
 #else // Windows console doesn't support colours
 	Sys_Print("\n\nEngine Crash: ", 16);
 	Sys_Print(sigdesc, strlen(sigdesc));