package/cppcms: bump to version 2.0.0-beta2

- Update indentation in hash file (two spaces)
- This bump will fix the following build failure if python2 is not
  available on host (while at it, add host-python3 dependency):

Traceback (most recent call last):
  File "/home/autobuild/autobuild/instance-4/output-1/build/cppcms-1.2.1/bin/cppcms_tmpl_cc", line 14, in <module>
    import StringIO
ModuleNotFoundError: No module named 'StringIO'

http://cppcms.com/wikipp/en/page/cppcms_2_0_whats_new

Fixes:
 - http://autobuild.buildroot.org/results/00482ee24deae95a91f8499f499b18e15f14b51a

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/cppcms/cppcms.mk

@@ -4,8 +4,8 @@
 #
 ################################################################################
 
-CPPCMS_VERSION = 1.2.1
-CPPCMS_SOURCE = cppcms-$(CPPCMS_VERSION).tar.bz2
+CPPCMS_VERSION = 2.0.0-beta2
+CPPCMS_SOURCE = cppcms-$(subst -,.,$(CPPCMS_VERSION)).tar.bz2
 CPPCMS_LICENSE = MIT, BSL-1.0 (boost), Public Domain (json2.js), Zlib (md5)
 CPPCMS_LICENSE_FILES = COPYING.TXT MIT.TXT THIRD_PARTY_SOFTWARE.TXT
 CPPCMS_SITE = http://downloads.sourceforge.net/project/cppcms/cppcms/$(CPPCMS_VERSION)
@@ -18,7 +18,7 @@ CPPCMS_CONF_OPTS = \
 	-DCMAKE_SKIP_RPATH=ON \
 	-DCMAKE_CXX_FLAGS="$(CPPCMS_CXXFLAGS)"
 
-CPPCMS_DEPENDENCIES = pcre
+CPPCMS_DEPENDENCIES = host-python3 pcre
 
 ifeq ($(BR2_PACKAGE_CPPCMS_ICU),y)
 CPPCMS_CONF_OPTS += -DDISABLE_ICU_LOCALE=OFF