Unbundle libfabric and ucx

mpich.spec

@@ -33,6 +33,8 @@ BuildRequires:  gcc
 BuildRequires:  gcc-c++
 BuildRequires:  gcc-gfortran
 BuildRequires:  hwloc-devel >= 2.0
+BuildRequires:  libfabric-devel
+BuildRequires:  ucx-devel
 BuildRequires:  autoconf
 BuildRequires:  automake
 BuildRequires:  libtool
@@ -134,6 +136,7 @@ mpich support for Python 3.
 ./autogen.sh
 
 CONFIGURE_OPTS=(
+        --with-custom-version-string=%{version}-%{release}
         --enable-sharedlibs=gcc
         --enable-shared
         --enable-static=no
@@ -152,6 +155,8 @@ CONFIGURE_OPTS=(
         --docdir=%{_datadir}/%{name}/doc
         --htmldir=%{_datadir}/%{name}/doc
         --with-hwloc-prefix=system
+        --with-libfabric=system
+        --with-ucx=system
 )
 
 # Set -fallow-argument-mismatch for #1795817