Update src/math/FGFunction.cpp #135

Job	Run time
XML validation	16s
MSIS code validation (ubuntu-latest)	3s
MSIS code validation (macos-latest)	10s
C/C++ build (MinGW) (ON)	3m 48s
C/C++ build (MinGW) (OFF)	3m 39s
C/C++ build (MSVC) (ON)	6m 23s
C/C++ build (Linux) (ubuntu-22.04, ON, ON, OFF, ON)	3m 34s
C/C++ build (MacOSX) (macos-12, 3.8)	3m 48s
C/C++ build (MSVC) (OFF)	4m 43s
C/C++ build (Linux) (ubuntu-22.04, ON, OFF, OFF, ON)	3m 45s
C/C++ build (MacOSX) (macos-14, 3.10)	3m 0s
C/C++ build (Linux) (ubuntu-22.04, OFF, ON, OFF, ON)	3m 41s
C/C++ build (Linux) (ubuntu-22.04, OFF, OFF, OFF, ON)	4m 0s
C/C++ build (Linux) (ubuntu-20.04, OFF, OFF, ON, OFF)	5m 26s
Build Python Module from Source	0s
Code coverage	1m 59s
Matlab S-Function (macos-12)	5m 30s
Matlab S-Function (ubuntu-22.04)	20m 27s
Build Python wheels	0s
Matlab S-Function (windows-latest)	7m 43s
Build Windows installer	0s
Deploy Rolling Release	0s
Deploy Stable Release	0s
Deploy Documentation	0s
	1h 21m 55s

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