boost: enable back log on powerpc with uclibc

boost-log builds fine with powerpc on uclibc nowadays so enable it back.
By removing this dependency, build failure on azmq is also fixed as this
package is currently selecting boost-log without fulfilling this
dependency

Fixes:
 - http://autobuild.buildroot.net/results/9c373d0b5a1a59e2271d71c480d55a90a67b84cb

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

package/boost/Config.in

@@ -203,9 +203,6 @@ comment "boost-locale needs a toolchain w/ dynamic library"
 config BR2_PACKAGE_BOOST_LOG
 	bool "boost-log"
 	depends on BR2_TOOLCHAIN_HAS_THREADS_NPTL
-	# for some reason, uClibc on PowerPC fails to build the boost
-	# log module
-	depends on !(BR2_powerpc && BR2_TOOLCHAIN_USES_UCLIBC)
 	select BR2_PACKAGE_BOOST_ATOMIC
 	select BR2_PACKAGE_BOOST_DATE_TIME
 	select BR2_PACKAGE_BOOST_FILESYSTEM
@@ -217,7 +214,6 @@ config BR2_PACKAGE_BOOST_LOG
 
 comment "boost-log needs a toolchain w/ NPTL"
 	depends on !BR2_TOOLCHAIN_HAS_THREADS_NPTL
-	depends on !(BR2_powerpc && BR2_TOOLCHAIN_USES_UCLIBC)
 
 config BR2_PACKAGE_BOOST_MATH
 	bool "boost-math"