[fedora] fix build in release on fc30+

fixes #1284

contrib/rpm/i2pd.spec

@@ -45,8 +45,13 @@ cd build
     -DWITH_LIBRARY=OFF \
     -DWITH_UPNP=ON \
     -DWITH_HARDENING=ON \
+%if 0%{?fedora} > 29
+    -DBUILD_SHARED_LIBS:BOOL=OFF \
+    .
+%else
     -DBUILD_SHARED_LIBS:BOOL=OFF
 %endif
+%endif
 
 make %{?_smp_mflags}