Don't use runtime python loading via dlopen().

Just link to libpython directly. That makes python dependency
more explicit and allows catching more compile-time bugs.
--- a/gui-wx/configure/Makefile.am
+++ b/gui-wx/configure/Makefile.am
@@ -22,7 +22,7 @@ golly_CPPFLAGS = $(AM_CPPFLAGS) $(WX_CPPFLAGS) $(PYTHON_INCLUDE) \
 	$(PERL_CPPFLAGS) $(PERL_INCLUDE) \
 	$(liblua_a_CPPFLAGS) -I$(top_srcdir)/../../lua
 golly_CXXFLAGS = $(AM_CXXFLAGS) $(WX_CXXFLAGS_ONLY)
-golly_LDADD = $(WX_LIBS) libgolly.a liblua.a
+golly_LDADD = $(WX_LIBS) $(PYTHON_LIBS) libgolly.a liblua.a
 
 if WINDOWS
 golly_LDADD += gollyres.o
--- a/gui-wx/configure/configure.ac
+++ b/gui-wx/configure/configure.ac
@@ -86,6 +86,16 @@ AS_IF([test "x$with_python_shlib" = xcheck],
 AS_IF([test "x$shlib" = x], AC_MSG_ERROR([could not determine Python shared library name]))
 AC_DEFINE_UNQUOTED([PYTHON_SHLIB], [$shlib])
 
+# Find python interpreter
+# 1. --embed is needed for python>=3.8
+# 2. statuc check is needed because python-3.7-config outputs error to stdout, not stderr
+if ${PYTHON}-config --libs --embed; then
+    PYTHON_LIBS=`${PYTHON}-config --libs --embed`
+elif ${PYTHON}-config --libs; then
+    PYTHON_LIBS=`${PYTHON}-config --libs`
+fi
+AC_SUBST(PYTHON_LIBS)
+
 # Find zlib (unless explicitly disabled)
 AS_IF([test "x$with_zlib" != xno],
 	[	AC_CHECK_HEADER([zlib.h], , [AC_MSG_ERROR([missing zlib])])
--- a/gui-wx/wxpython.cpp
+++ b/gui-wx/wxpython.cpp
@@ -59,8 +59,12 @@
     #undef SIZEOF_SIZE_T
     #undef SIZEOF_VOID_P
 #else
-    // load Python lib at runtime
-    #define USE_PYTHON_DYNAMIC
+    // On gentoo just link against python to make
+    // python dependency more explicit.
+    # if 0
+      // load Python lib at runtime
+      #define USE_PYTHON_DYNAMIC
+    #endif
 
     #ifdef __UNIX__
         // avoid warning on Linux