tools: gengetopt: Disable doc and tests builds

Simply disable the build of the "doc" and "tests" directories to speed up the
build and avoid the potential for errors coming from external tools being used
(e.g: source-highlight installed on a non-standard location).

Signed-off-by: Florian Fainelli <florian@openwrt.org>

SVN-Revision: 45713

tools/gengetopt/patches/200-no_docs_tests.patch

@@ -0,0 +1,13 @@
+diff -urN gengetopt-2.22.6/Makefile.am gengetopt-2.22.6.new/Makefile.am
+--- gengetopt-2.22.6/Makefile.am	2012-11-02 06:26:54.000000000 -0700
++++ gengetopt-2.22.6.new/Makefile.am	2015-05-21 17:43:15.183083542 -0700
+@@ -18,6 +18,6 @@
+ ACLOCAL_AMFLAGS = -I m4 -I gl/m4
+ 
+ EXTRA_DIST = configure TODO LICENSE gl/m4/gnulib-cache.m4
+-SUBDIRS = gl src doc tests
++SUBDIRS = gl src
+ 
+-gengetoptdoc_DATA = ChangeLog COPYING NEWS THANKS INSTALL README LICENSE
+\ No newline at end of file
++gengetoptdoc_DATA = ChangeLog COPYING NEWS THANKS INSTALL README LICENSE