golang: Add golang-doc subpackage (fixes #2000)

packages/golang/build.sh

@@ -3,6 +3,7 @@ TERMUX_PKG_DESCRIPTION="Go programming language compiler"
 local _MAJOR_VERSION=1.9.4
 # Use the ~ deb versioning construct in the future:
 TERMUX_PKG_VERSION=2:${_MAJOR_VERSION}
+TERMUX_PKG_REVISION=1
 TERMUX_PKG_SRCURL=https://storage.googleapis.com/golang/go${_MAJOR_VERSION}.src.tar.gz
 TERMUX_PKG_SHA256=0573a8df33168977185aa44173305e5a0450f55213600e94541604b75d46dc06
 TERMUX_PKG_KEEP_STATIC_LIBRARIES=true
@@ -14,7 +15,7 @@ termux_step_make_install () {
 	TERMUX_GOLANG_DIRNAME=${GOOS}_$GOARCH
 	TERMUX_GODIR=$TERMUX_PREFIX/lib/go
 	rm -Rf $TERMUX_GODIR
-	mkdir -p $TERMUX_GODIR/{src,lib,pkg/tool/$TERMUX_GOLANG_DIRNAME,pkg/include,pkg/${TERMUX_GOLANG_DIRNAME}}
+	mkdir -p $TERMUX_GODIR/{src,doc,lib,pkg/tool/$TERMUX_GOLANG_DIRNAME,pkg/include,pkg/${TERMUX_GOLANG_DIRNAME}}
 
 	cd $TERMUX_PKG_SRCDIR/src
 	env CC_FOR_TARGET=$CC \
@@ -30,6 +31,7 @@ termux_step_make_install () {
 	cp VERSION $TERMUX_GODIR/
 	cp pkg/tool/$TERMUX_GOLANG_DIRNAME/* $TERMUX_GODIR/pkg/tool/$TERMUX_GOLANG_DIRNAME/
 	cp -Rf src/* $TERMUX_GODIR/src/
+	cp -Rf doc/* $TERMUX_GODIR/doc/
 	cp pkg/include/* $TERMUX_GODIR/pkg/include/
 	cp -Rf lib/* $TERMUX_GODIR/lib
 	cp -Rf pkg/${TERMUX_GOLANG_DIRNAME}/* $TERMUX_GODIR/pkg/${TERMUX_GOLANG_DIRNAME}/

packages/golang/golang-doc.subpackage.sh

@@ -0,0 +1,3 @@
+TERMUX_SUBPKG_INCLUDE="lib/go/doc"
+TERMUX_SUBPKG_DESCRIPTION="Go programming language - documentation"
+TERMUX_SUBPKG_DEPENDS="golang"