g.extension: remove 'install' from requirements (see include/Make/Platform.in)

	     trac https://trac.osgeo.org/grass/ticket/1406


git-svn-id: https://svn.osgeo.org/grass/grass/trunk@47187 15284696-431f-4ddb-bdfa-cd5b030d7da7

scripts/g.extension/g.extension.py

@@ -98,7 +98,7 @@ from grass.script import core as grass
 remove_tmpdir = True
 
 def check():
-    for prog in ('svn', 'make', 'install', 'gcc'):
+    for prog in ('svn', 'make', 'gcc'):
         if not grass.find_program(prog, ['--help']):
             grass.fatal(_("'%s' required. Please install '%s' first.") % (prog, prog))