Fontconfig_GetPath() did not get the font file path #181

Describe the bug

On the Ubuntu system, Fontconfig_GetPath() does not correctly get the file location of the default font, the default font actually used is in-core.inconsolata

Console output:

...
[font] current font engine is: FreeType
[font] fontconfig enabled
[font] load file: (null)
[font] failed to load file: (null)
[font] load file: (null)
[font] failed to load file: (null)
[font] load file: (null)
[font] failed to load file: (null)
...

To Reproduce Run cammnd:

make
cd test
./helloworld

Check console output.

Expected behavior Font file should load correctly.

Environment (please complete the following information):

• LCUI version: develop branch
• Build tools: gcc
• OS and version: Ubuntu

Additional context

Related code：

https://github.com/lc-soft/LCUI/blob/d52bae5b0368f2d780c980f0e59badcd40c87dfe/src/font/fontlibrary.c#L918-L942

https://github.com/lc-soft/LCUI/blob/d52bae5b0368f2d780c980f0e59badcd40c87dfe/src/font/fontconfig.c#L42-L71