expat: add patch to not build docs

packages/textproc/expat/package.mk

@@ -31,9 +31,4 @@ PKG_LONGDESC="Expat is an XML parser library written in C. It is a stream-orient
 PKG_IS_ADDON="no"
 PKG_AUTORECONF="no"
 
-PKG_CMAKE_OPTS_TARGET="-DBUILD_tools=OFF -DBUILD_examples=OFF -DBUILD_tests=OFF -DBUILD_shared=ON"
+PKG_CMAKE_OPTS_TARGET="-DBUILD_docs=OFF -DBUILD_tools=OFF -DBUILD_examples=OFF -DBUILD_tests=OFF -DBUILD_shared=ON"
-
-pre_make_target() {
-  # fix builderror when building in subdirs
-  cp -r ../doc .
-}

packages/textproc/expat/patches/expat-0001-allow-disabling-doc-build.patch

@@ -0,0 +1,23 @@
+diff -Naur a/CMakeLists.txt b/CMakeLists.txt
+--- a/CMakeLists.txt	2016-06-21 05:58:38.000000000 -0700
++++ b/CMakeLists.txt	2017-10-10 09:39:36.713079492 -0700
+@@ -10,6 +10,7 @@
+ set(PACKAGE_STRING "${PACKAGE_NAME} ${PACKAGE_VERSION}")
+ set(PACKAGE_TARNAME "${PACKAGE_NAME}")
+ 
++option(BUILD_docs "build the docs for expat library" ON)
+ option(BUILD_tools "build the xmlwf tool for expat library" ON)
+ option(BUILD_examples "build the examples for expat library" ON)
+ option(BUILD_tests "build the tests for expat library" ON)
+@@ -92,8 +93,9 @@
+ install(FILES lib/expat.h lib/expat_external.h DESTINATION include)
+ install(FILES ${CMAKE_CURRENT_BINARY_DIR}/expat.pc DESTINATION lib/pkgconfig)
+ 
+-
+-add_custom_command(TARGET expat PRE_BUILD COMMAND $(MAKE) -C doc xmlwf.1)
++if(BUILD_docs)
++    add_custom_command(TARGET expat PRE_BUILD COMMAND $(MAKE) -C doc xmlwf.1)
++endif()
+ 
+ if(BUILD_tools AND NOT WINCE)
+     set(xmlwf_SRCS