[ft-devel] Commit f4a353165 breaks CMake build

[Nikolaus Waxweiler]

Will come up with something,

CMaking master yields:
```
[...]
[100%] Linking C shared library libfreetype.so
CMakeFiles/freetype.dir/src/base/ftfntfmt.c.o: In function `FT_Get_Font_Format':
ftfntfmt.c:(.text+0x0): multiple definition of `FT_Get_Font_Format'
CMakeFiles/freetype.dir/src/base/ftbase.c.o:ftbase.c:(.text+0xfb5):
first defined here
CMakeFiles/freetype.dir/src/base/ftfntfmt.c.o: In function
`FT_Get_X11_Font_Format':
ftfntfmt.c:(.text+0x6f): multiple definition of `FT_Get_X11_Font_Format'
CMakeFiles/freetype.dir/src/base/ftbase.c.o:ftbase.c:(.text+0x1024):
first defined here
CMakeFiles/freetype.dir/src/base/ftlcdfil.c.o: In function `ft_lcd_padding':
ftlcdfil.c:(.text+0x0): multiple definition of `ft_lcd_padding'
CMakeFiles/freetype.dir/src/base/ftbase.c.o:ftbase.c:(.text+0x2135):
first defined here
CMakeFiles/freetype.dir/src/base/ftlcdfil.c.o: In function
`FT_Library_SetLcdFilterWeights':
ftlcdfil.c:(.text+0x37): multiple definition of `FT_Library_SetLcdFilterWeights'
CMakeFiles/freetype.dir/src/base/ftbase.c.o:ftbase.c:(.text+0x216c):
first defined here
CMakeFiles/freetype.dir/src/base/ftlcdfil.c.o: In function
`FT_Library_SetLcdFilter':
ftlcdfil.c:(.text+0x4a): multiple definition of `FT_Library_SetLcdFilter'
CMakeFiles/freetype.dir/src/base/ftbase.c.o:ftbase.c:(.text+0x217f):
first defined here
collect2: error: ld returned 1 exit status
[...]
```