Fix experimental filesystem support

myd7349 · myd7349 · commit eed354995cb8 · 2021-04-10T21:25:14.000+08:00
According to those comments at the beginning of `FindFilesystem.cmake`,
if no components are provided when calling `find_package`, it behaves as
if the `Final` component was specified.
Only if we specify both of `Experimental` and `Final` components, it will
falls back to experimental filesystem if final one is unavailable.
This will fix the build errors with g++ v7.
diff --git a/source/matplot/CMakeLists.txt b/source/matplot/CMakeLists.txt
@@ -1,4 +1,4 @@
-find_package(Filesystem REQUIRED)
+find_package(Filesystem REQUIRED COMPONENTS Experimental Final)
 
 add_library(matplot
         matplot.h

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		`-find_package(Filesystem REQUIRED)`
	`1`	`+find_package(Filesystem REQUIRED COMPONENTS Experimental Final)`
`2`	`2`
`3`	`3`	`add_library(matplot`
`4`	`4`	`matplot.h`