Autotools: Use AS_* macros in embed SAPI (#15387)

Author: petk

sapi/embed/config.m4

@@ -8,29 +8,27 @@ PHP_ARG_ENABLE([embed],,
 AC_MSG_CHECKING([for embedded SAPI library support])
 
 if test "$PHP_EMBED" != "no"; then
-  case "$PHP_EMBED" in
-    yes|shared)
+  AS_CASE([$PHP_EMBED],
+    [yes|shared], [
       LIBPHP_CFLAGS="-shared"
       PHP_EMBED_TYPE=shared
       INSTALL_IT="\$(mkinstalldirs) \$(INSTALL_ROOT)\$(orig_libdir); \$(INSTALL) -m 0755 $SAPI_SHARED \$(INSTALL_ROOT)\$(orig_libdir)"
-      ;;
-    static)
+    ],
+    [static], [
       LIBPHP_CFLAGS="-static"
       PHP_EMBED_TYPE=static
       INSTALL_IT="\$(mkinstalldirs) \$(INSTALL_ROOT)\$(orig_libdir); \$(INSTALL) -m 0644 $SAPI_STATIC \$(INSTALL_ROOT)\$(orig_libdir)"
-      ;;
-    *)
-      PHP_EMBED_TYPE=no
-      ;;
-  esac
-  if test "$PHP_EMBED_TYPE" != "no"; then
+    ],
+    [PHP_EMBED_TYPE=no])
+
+  AS_VAR_IF([PHP_EMBED_TYPE], [no],, [
     PHP_SUBST([LIBPHP_CFLAGS])
     PHP_SELECT_SAPI([embed],
       [$PHP_EMBED_TYPE],
       [php_embed.c],
       [-DZEND_ENABLE_STATIC_TSRMLS_CACHE=1])
     PHP_INSTALL_HEADERS([sapi/embed], [php_embed.h])
-  fi
+  ])
   AC_MSG_RESULT([$PHP_EMBED_TYPE])
   AC_SUBST([PHP_EMBED_TYPE])
 else