Merge pull request #2127 from commodo/ola-fix-build

ola: fix build (linking issue TCPSocket::ReadDescriptor() const)

net/ola/patches/002-remove-visibility-inlines-hidden-flag.patch

@@ -0,0 +1,13 @@
+diff --git a/Makefile.am b/Makefile.am
+index 22647be..7dcf0de 100644
+--- a/Makefile.am
++++ b/Makefile.am
+@@ -32,7 +32,7 @@ AM_DISTCHECK_CONFIGURE_FLAGS = --enable-python-libs
+ COMMON_CXXFLAGS_ONLY_WARNINGS = \
+     -I$(top_srcdir)/include \
+     -I$(top_builddir)/include \
+-    -Wall -Wformat -W -fvisibility-inlines-hidden \
++    -Wall -Wformat -W \
+     $(libprotobuf_CFLAGS)
+ 
+ COMMON_CXXFLAGS = $(COMMON_CXXFLAGS_ONLY_WARNINGS)