[PATCH] Drop mention of libusb from INSTALL

[Robbie Harwood]

9d25b0da9a8cce9b3766f4e1b449d7936d5ba124 ("Remove emu libusb support.")
dropped use of libusb, but did not remove mention of it from INSTALL.

Signed-off-by: Robbie Harwood <rharwood@redhat.com>
---
 INSTALL | 2 --
 1 file changed, 2 deletions(-)

diff --git a/INSTALL b/INSTALL
index a64f63723..48608be58 100644
--- a/INSTALL
+++ b/INSTALL
@@ -36,7 +36,6 @@ For optional grub-emu features, you need:
 
 * SDL (recommended)
 * libpciaccess (optional)
-* libusb (optional)
 
 To build GRUB's graphical terminal (gfxterm), you need:
 
@@ -252,7 +251,6 @@ corresponding platform are not needed for the platform in 
question.
   - Additionally for emu, for host and target.
     1. SDL is looked for in standard linker directories (-lSDL) (optional)
     2. libpciaccess is looked for in standard linker directories (-lpciaccess) 
(optional)
-    3. libusb is looked for in standard linker directories (-lusb) (optional)
 
   - Platform-agnostic tools and data.
     1. make is the tool you execute after ./configure.
-- 
2.34.1