[gimp] INSTALL: libmypaint doesn't use scons anymore...

[Jehan Pagès <jehanp src gnome org>]

commit ed8a9c97cfeed7b2e68f47d148e139ade67bc421
Author: Jehan <jehan girinstud io>
Date:   Thu Jun 2 00:52:53 2016 +0200

    INSTALL: libmypaint doesn't use scons anymore...
    
    ... and --with-sendmail option has a slightly different usage.

 INSTALL.in |   13 ++++---------
 1 files changed, 4 insertions(+), 9 deletions(-)
---
diff --git a/INSTALL.in b/INSTALL.in
index b234423..57ffb50 100644
--- a/INSTALL.in
+++ b/INSTALL.in
@@ -80,12 +80,6 @@ header files installed.
      not be disabled.
 
  10. For MyPaint brushes, brushlib (libmypaint) @LIBMYPAINT_REQUIRED_VERSION@ is used.
-
-     To build and install libmypaint:
-
-       `scons prefix=<your prefix>`
-       `scons prefix=<your prefix> install`
-
      The libmypaint repository is hosted at:
 
         https://github.com/mypaint/libmypaint
@@ -298,9 +292,10 @@ These are:
   --disable-mp. This option allows you to disable support for multiple
      processors. It is enabled by default.
 
-  --with-sendmail=[PATH]. This option is used to tell GIMP where to find
-     the sendmail command. Normally this options don't have to be used
-     because configure tries to find it in the usual places.
+  --with-sendmail[=PATH]. This option is used to tell GIMP to send email
+     through sendmail instead of xdg-email. You can optionally indicate
+     where to find the sendmail command. Otherwise sendmail will simply
+     be search in your $PATH at runtime.
 
   --with-desktop-dir=[PATH]. This option specifies where to install
      desktop files. These files are used by desktop environments that