Update cheatsheets

tldr/linux/euse

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# euse
+
+> Enable, disable, and obtain information about Gentoo USE flags.
+> More information: <https://wiki.gentoo.org/wiki/Euse>.
+
+- List active global USE flags:
+
+`euse --active --global`
+
+- List active local USE flags:
+
+`euse --active --local`
+
+- Enable a global USE flag:
+
+`sudo euse --enable {{use_flag}}`
+
+- Disable a global USE flag (put a '-' sign in front of the USE flag):
+
+`sudo euse --disable {{use_flag}}`
+
+- Remove a global USE flag:
+
+`sudo euse --prune {{use_flag}}`