tesseract-ocr: disable documentation

Fixes:
 - http://autobuild.buildroot.org/results/a608e9bfb2b0161c45ae490e2866d96763593723

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Acked-by: Gilles Talis <gilles.talis@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/tesseract-ocr/tesseract-ocr.mk

@@ -19,6 +19,7 @@ TESSERACT_OCR_AUTORECONF = YES
 TESSERACT_OCR_DEPENDENCIES = leptonica host-pkgconf
 TESSERACT_OCR_INSTALL_STAGING = YES
 TESSERACT_OCR_CONF_ENV = \
+	ac_cv_prog_have_asciidoc=false \
 	LIBLEPT_HEADERSDIR=$(STAGING_DIR)/usr/include/leptonica
 TESSERACT_OCR_CONF_OPTS = \
 	--disable-opencl