Fix syntax error in RobustDOP (period instead of semicolon)

[CodeReclaimers]

Lines 113 and 216 of Functions.h end with . instead of ; inside #if defined(GTE_DISCARD_FMA), causing compilation failure when that macro is defined.

Test: compile with -DGTE_DISCARD_FMA and call RobustDOP.

Test (CMakeLists.txt)

cmake_minimum_required(VERSION 3.14)
project(test_issue_8_1 LANGUAGES CXX)
set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(GTE_ROOT "${CMAKE_CURRENT_SOURCE_DIR}/../../GTE")
add_executable(test_issue_8_1 test_issue_8_1.cpp)
target_include_directories(test_issue_8_1 PRIVATE "${GTE_ROOT}")
target_compile_definitions(test_issue_8_1 PRIVATE GTE_DISCARD_FMA)

Test (test_issue_8_1.cpp)

#include <cstdlib>
#include <cmath>
#include <Mathematics/Functions.h>

int main()
{
    float rf = gte::RobustDOP(1.0f, 2.0f, 0.5f, 1.0f);
    double rd = gte::RobustDOP(1.0, 2.0, 0.5, 1.0);
    bool ok = (std::fabs(rf - 1.5f) < 1e-6f) && (std::fabs(rd - 1.5) < 1e-12);
    return ok ? EXIT_SUCCESS : EXIT_FAILURE;
}