Add gcc-5.5.0-0

This is an option, if some software needs an 'older' compiler
to build.

Callup:

gcc5      gives you the C compiler,
gxx5      calls g++, and now guess what
fortran5  will call.

gcc-5.5.0-0.build.sh

@@ -0,0 +1,68 @@
+#! /bin/bash
+
+PKG=gcc
+VERSION=5.5.0
+BUILD=0
+URL=http://ftp.gnu.org/gnu/gcc/gcc-${VERSION}/gcc-${VERSION}.tar.gz
+
+PREFIX=/pkg/$PKG-$VERSION-$BUILD
+#PREFIX=/dev/shm/pkg/$PKG-$VERSION-$BUILD
+
+set -xe
+umask 022
+
+BUILD_TMPDIR=/dev/shm/$PKG-$VERSION-$BUILD.build.tmp
+test -d $BUILD_TMPDIR && rm -rf $BUILD_TMPDIR
+mkdir -p $BUILD_TMPDIR/home
+export TMPDIR=$BUILD_TMPDIR
+export HOME=$BUILD_TMPDIR/home
+
+exec </dev/null
+
+mkdir -p $PREFIX
+cat >$PREFIX/profile <<-EOF
+	PATH=$PREFIX/bin:\$PATH
+EOF
+. $PREFIX/profile
+
+export MAKEFLAGS="-j $(nproc)"
+
+BUILDDIR=$PREFIX/build
+
+mkdir -p $BUILDDIR
+cd $BUILDDIR
+
+test -e gcc-${VERSION}.tar.gz || wget $URL
+test -d gcc-$VERSION          || tar xvf gcc-${VERSION}.tar.gz
+cd gcc-$VERSION
+
+./configure \
+  --prefix=$PREFIX \
+  --enable-shared \
+  --enable-threads=posix \
+  --enable-__cxa_atexit \
+  --enable-clocale=gnu \
+  --enable-languages=c,fortran,c++,objc,obj-c++ \
+  --disable-multilib \
+  --with-system-zlib
+
+make
+make -k check 2>&1 | tee check.log
+make install
+
+cd $PREFIX
+mkdir -vp lib
+ln -sv ${PREFIX}/bin/cpp lib/
+ln -sv gcc bin/cc
+
+install -v -dm755 lib/bfd-plugins
+ln -sfv ../../libexec/gcc/$(gcc -dumpmaschine)/$VERSION/liblto_plugin.so lib/bfd-plugins/
+
+mv -v lib64/* lib/
+rmdir -v lib64
+
+mkdir -p share/gdb/auto-load/lib
+mv -v lib/*-gdb.py share/gdb/auto-load/lib
+
+# exit 1 # final test, inhibits 'closing' on success
+exit