Improve support for PyPy in python_mod_optimize().
(Patch by Arfrever. Backported from Progress Overlay.)
--- python.eclass
+++ python.eclass
@@ -2980,7 +2980,7 @@
 						eval "dirs+=(\"\${root}${dir}\")"
 					done
 					stderr+="${stderr:+$'\n'}$("$(PYTHON)" -m compileall "${options[@]}" "${dirs[@]}" 2>&1)" || return_code="1"
-					if [[ "$(_python_get_implementation "${PYTHON_ABI}")" != "Jython" ]]; then
+					if ! has "$(_python_get_implementation "${PYTHON_ABI}")" Jython PyPy; then
 						"$(PYTHON)" -O -m compileall "${options[@]}" "${dirs[@]}" &> /dev/null || return_code="1"
 					fi
 					_python_clean_compiled_modules "${dirs[@]}"
@@ -2993,7 +2993,7 @@
 						eval "files+=(\"\${root}${file}\")"
 					done
 					stderr+="${stderr:+$'\n'}$("$(PYTHON)" -m py_compile "${files[@]}" 2>&1)" || return_code="1"
-					if [[ "$(_python_get_implementation "${PYTHON_ABI}")" != "Jython" ]]; then
+					if ! has "$(_python_get_implementation "${PYTHON_ABI}")" Jython PyPy; then
 						"$(PYTHON)" -O -m py_compile "${files[@]}" &> /dev/null || return_code="1"
 					fi
 					_python_clean_compiled_modules "${files[@]}"
@@ -3024,14 +3024,14 @@
 			ebegin "Compilation and optimization of Python modules placed outside of site-packages directories for $(python_get_implementation_and_version)"
 			if ((${#other_dirs[@]})); then
 				stderr+="${stderr:+$'\n'}$("$(PYTHON ${PYTHON_ABI})" -m compileall "${options[@]}" "${other_dirs[@]}" 2>&1)" || return_code="1"
-				if [[ "$(_python_get_implementation "${PYTHON_ABI}")" != "Jython" ]]; then
+				if ! has "$(_python_get_implementation "${PYTHON_ABI}")" Jython PyPy; then
 					"$(PYTHON ${PYTHON_ABI})" -O -m compileall "${options[@]}" "${other_dirs[@]}" &> /dev/null || return_code="1"
 				fi
 				_python_clean_compiled_modules "${other_dirs[@]}"
 			fi
 			if ((${#other_files[@]})); then
 				stderr+="${stderr:+$'\n'}$("$(PYTHON ${PYTHON_ABI})" -m py_compile "${other_files[@]}" 2>&1)" || return_code="1"
-				if [[ "$(_python_get_implementation "${PYTHON_ABI}")" != "Jython" ]]; then
+				if ! has "$(_python_get_implementation "${PYTHON_ABI}")" Jython PyPy; then
 					"$(PYTHON ${PYTHON_ABI})" -O -m py_compile "${other_files[@]}" &> /dev/null || return_code="1"
 				fi
 				_python_clean_compiled_modules "${other_files[@]}"