fixup! build: add --shared-abseil-cpp configure flag

Author: aduh95

configure.py

@@ -587,18 +587,18 @@
 
 shared_optgroup.add_argument('--shared-abseil-cpp-includes',
     action='store',
-    dest='shared_abseil',
+    dest='shared_abseil_includes',
     help='directory containing abseil header files')
 
 shared_optgroup.add_argument('--shared-abseil-cpp-libname',
     action='store',
-    dest='shared_abseil',
+    dest='shared_abseil_libname',
     default='abseil',
     help='alternative lib name to link to [default: %(default)s]')
 
 shared_optgroup.add_argument('--shared-abseil-cpp-libpath',
     action='store',
-    dest='shared_abseil',
+    dest='shared_abseil_libpath',
     help='a directory to search for the shared abseil DLL')
 
 shared_optgroup.add_argument('--shared-ada',