use system stdlibs on Linux (fdo#45074, fdo#45696)

We use pretty old compiler for the official build, so it should be compatible
with most systems. The old system libraries breaked 3rd-party extensions.
There were also problems with exceptions hadnling.

distro-configs/LibreOfficeLinux.conf

@@ -2,7 +2,6 @@
 --with-system-dicts
 --without-unix-wrapper
 --without-system-zlib
---without-system-stdlibs
 --without-system-poppler
 --without-system-openssl
 --without-system-mozilla

distro-configs/OxygenOfficeLinux.conf

@@ -47,11 +47,9 @@
 --with-sun-templates
 --without-system-poppler
 --enable-neon
---without-system-stdlibs
 --with-jdk-home=/usr/local/jdk1.6.0_23/
 --without-system-dicts
 --without-system-zlib
---without-system-stdlibs
 --without-system-poppler
 --without-system-openssl
 --without-system-mozilla