Bump the versions of Ipopt and its dependency libraries.
Delete old versions.
Add a workaround for a problem during making "ipopt_addlibs_cpp.txt".

The problem is caused by setting PKG_CONFIG_PATH to the real install
path instead of ebuild's install image.

The following is the log:
---
make[3]: Entering directory `/tmp/portage/sci-libs/ipopt-3.10.2/work/Ipopt-3.10.2/Ipopt'
test -z "/usr/share/coin/doc/Ipopt" || mkdir -p -- "/tmp/portage/sci-libs/ipopt-3.10.2/image//usr/share/coin/doc/Ipopt"
test -z "/usr/lib64/pkgconfig" || mkdir -p -- "/tmp/portage/sci-libs/ipopt-3.10.2/image//usr/lib64/pkgconfig"
for file in README AUTHORS LICENSE; do \
  if test -f "$file"; then dir=; else dir="./"; fi; \
  if test -f "$dir$file"; then /usr/bin/install -c -m 644 "$dir$file" "/tmp/portage/sci-libs/ipopt-3.10.2/image//usr/share/coin/doc/Ipopt/$file"; fi; \
done
 /usr/bin/install -c -m 644 'ipopt.pc' '/tmp/portage/sci-libs/ipopt-3.10.2/image//usr/lib64/pkgconfig/ipopt.pc'
make  install-data-hook
make[4]: Entering directory `/tmp/portage/sci-libs/ipopt-3.10.2/work/Ipopt-3.10.2/Ipopt'
PKG_CONFIG_PATH=/usr/lib/pkgconfig:/usr/share/pkgconfig:/usr/lib64/pkgconfig \
/usr/bin/pkg-config --libs ipopt > /tmp/portage/sci-libs/ipopt-3.10.2/image//usr/share/coin/doc/Ipopt/ipopt_addlibs_cpp.txt
Package ipopt was not found in the pkg-config search path.
Perhaps you should add the directory containing `ipopt.pc'
to the PKG_CONFIG_PATH environment variable
No package 'ipopt' found
make[4]: *** [install-data-hook] Error 1
make[4]: Leaving directory `/tmp/portage/sci-libs/ipopt-3.10.2/work/Ipopt-3.10.2/Ipopt'
make[3]: *** [install-data-am] Error 2
make[3]: Leaving directory `/tmp/portage/sci-libs/ipopt-3.10.2/work/Ipopt-3.10.2/Ipopt'
make[2]: *** [install-am] Error 2
make[2]: Leaving directory `/tmp/portage/sci-libs/ipopt-3.10.2/work/Ipopt-3.10.2/Ipopt'
make[1]: *** [install-recursive] Error 1
make[1]: Leaving directory `/tmp/portage/sci-libs/ipopt-3.10.2/work/Ipopt-3.10.2/Ipopt'
make: *** [install-recursive] Error 1
emake failed
 * ERROR: sci-libs/ipopt-3.10.2 failed (install phase):
 *   emake install failed
 *
 * Call stack:
 *     ebuild.sh, line  85:  Called src_install
 *   environment, line 2168:  Called die
 * The specific snippet of code:
 *       emake DESTDIR="${D}" install || die "emake install failed";
Add 'metadata/layout.conf'.