package/boost: install cmake files

This reverts commit 4349746dac6f55b0b0faca21a7e609fb67d1471b
which states:
    commit 4349746dac6f55b0b0faca21a7e609fb67d1471b
    Author: Fabrice Fontaine <fontaine.fabrice@gmail.com>
    Date:   Thu Apr 18 11:13:50 2019 +0200

    package/boost: don't install boost cmake files

    Since version 1.70.0, boost installs its own cmake files which are
    utterly broken so don't install them otherwise all cmake packages using
    boost (host-thrift, domoticz, i2pd ...) will fail because
    BOOST_INCLUDE_DIRS will be empty

    Fixes:
     - http://autobuild.buildroot.org/results/4ada26bab5c1e6504c7d8c92672326ced1d336df

    Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
    Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

However, this has since been fixed upstream in the five years this change
has been in Buildroot. Furthermore, having --no-cmake-config breaks packages
expecting to dynamically link to boost::log with a multitude of `undefined
reference to boost::log` errors.
See: https://github.com/mendersoftware/mender/pull/1663 for one such example.

As the --no-cmake-config is no longer needed because the original problem has
long since been fixed upstream, it is safe to revert the change.

Tested with the following packages as a smoke test:

  - host-thrift
  - domoticz
  - i2pd
  - libcpprestsdk
  - log4cxx
  - mpd
  - libcamera-apps

Signed-off-by: Adam Duskett <adam.duskett@amarulasolutions.com>
Signed-off-by: Arnout Vandecappelle <arnout@mind.be>

package/boost/boost.mk

@@ -103,7 +103,7 @@ BOOST_TARGET_CXXFLAGS += -I$(STAGING_DIR)/usr/include/python$(PYTHON3_VERSION_MA
 BOOST_DEPENDENCIES += python3
 endif
 
-HOST_BOOST_OPTS += --no-cmake-config toolset=gcc threading=multi \
+HOST_BOOST_OPTS += toolset=gcc threading=multi \
 	variant=release link=shared runtime-link=shared -j$(PARALLEL_JOBS) -q \
 	--ignore-site-config --layout=system --prefix=$(HOST_DIR) \
 	--user-config=$(@D)/user-config.jam
@@ -116,8 +116,7 @@ else
 BOOST_ABI = sysv
 endif
 
-BOOST_OPTS += --no-cmake-config \
-	toolset=gcc \
+BOOST_OPTS += toolset=gcc \
 	threading=multi \
 	abi=$(BOOST_ABI) \
 	variant=$(if $(BR2_ENABLE_RUNTIME_DEBUG),debug,release) \