git-instaweb: pass through invoking user's path to gitweb CGI scripts

When used with lighttpd or mongoose, git-instaweb previously passed a
hard-coded, default value of PATH to the gitweb CGI script. Use the invoking
user's value for PATH for this instead. (This is already implicitly the
behaviour for other web servers supported by git-instaweb.)

Signed-off-by: Chris Webb <chris@arachsys.com>
Acked-by: Eric Wong <normalperson@yhbt.net>

git-instaweb.sh

@@ -212,7 +212,7 @@ server.errorlog = "$fqgitdir/gitweb/error.log"
 # variable above and uncomment this
 #accesslog.filename = "$fqgitdir/gitweb/access.log"
 
-setenv.add-environment = ( "PATH" => "/usr/local/bin:/usr/bin:/bin" )
+setenv.add-environment = ( "PATH" => env.PATH )
 
 cgi.assign = ( ".cgi" => "" )
 
@@ -361,7 +361,7 @@ error_log	$fqgitdir/gitweb/error.log
 access_log	$fqgitdir/gitweb/access.log
 
 #cgi setup
-cgi_env		PATH=/usr/local/bin:/usr/bin:/bin,GIT_DIR=$GIT_DIR,GIT_EXEC_PATH=$GIT_EXEC_PATH
+cgi_env		PATH=$PATH,GIT_DIR=$GIT_DIR,GIT_EXEC_PATH=$GIT_EXEC_PATH
 cgi_interp	$PERL
 cgi_ext		cgi,pl