Use AC_SUBST instead of PHP_SUBST_OLD where possible (#13993)

The PHP_SUBST_OLD adds variables to generated Makefile and creates
output shell variables to replace the @variable_name@ placeholders in
templates. These changed variables are not used in the generated
Makefile so the AC_SUBST is sufficient.

- ext/odbc
- sapi/embed
- sapi/fpm
- only substituted in scripts/php-config.in:
  - PHP_INSTALLED_SAPIS
  - SAPI_LIBNAME_SHARED
  - SAPI_LIBNAME_STATIC

configure.ac

@@ -1474,6 +1474,9 @@ AC_SUBST(EXPANDED_SYSCONFDIR)
 AC_SUBST(EXPANDED_LOCALSTATEDIR)
 AC_SUBST(EXPANDED_PHP_CONFIG_FILE_PATH)
 AC_SUBST(EXPANDED_PHP_CONFIG_FILE_SCAN_DIR)
+AC_SUBST([PHP_INSTALLED_SAPIS])
+AC_SUBST([SAPI_LIBNAME_SHARED])
+AC_SUBST([SAPI_LIBNAME_STATIC])
 
 PHP_UTILIZE_RPATHS
 
@@ -1500,8 +1503,6 @@ if test -n "${PHP_BUILD_ARCH}"; then
   AC_DEFINE_UNQUOTED(PHP_BUILD_ARCH,"$PHP_BUILD_ARCH",[build architecture])
 fi
 
-PHP_SUBST_OLD(PHP_INSTALLED_SAPIS)
-
 PHP_SUBST(PHP_FASTCGI_OBJS)
 PHP_SUBST(PHP_SAPI_OBJS)
 PHP_SUBST(PHP_BINARY_OBJS)
@@ -1563,8 +1564,6 @@ PHP_SUBST(SHELL)
 PHP_SUBST(PHP_FRAMEWORKS)
 PHP_SUBST(PHP_FRAMEWORKPATH)
 PHP_SUBST(INSTALL_HEADERS)
-PHP_SUBST_OLD(SAPI_LIBNAME_SHARED)
-PHP_SUBST_OLD(SAPI_LIBNAME_STATIC)
 
 old_CC=$CC
 

ext/odbc/config.m4

@@ -454,10 +454,10 @@ if test -n "$ODBC_TYPE"; then
   PHP_SUBST(ODBC_SHARED_LIBADD)
   PHP_SUBST(ODBC_INCDIR)
   PHP_SUBST(ODBC_LIBDIR)
-  PHP_SUBST_OLD(ODBC_CFLAGS)
-  PHP_SUBST_OLD(ODBC_LIBS)
-  PHP_SUBST_OLD(ODBC_LFLAGS)
-  PHP_SUBST_OLD(ODBC_TYPE)
+  AC_SUBST([ODBC_CFLAGS])
+  AC_SUBST([ODBC_LIBS])
+  AC_SUBST([ODBC_LFLAGS])
+  AC_SUBST([ODBC_TYPE])
 
   PHP_NEW_EXTENSION(odbc, php_odbc.c odbc_utils.c, $ext_shared,, [$ODBC_CFLAGS -DZEND_ENABLE_STATIC_TSRMLS_CACHE=1])
 else

sapi/embed/config.m4

@@ -29,7 +29,7 @@ if test "$PHP_EMBED" != "no"; then
     PHP_INSTALL_HEADERS([sapi/embed], [php_embed.h])
   fi
   AC_MSG_RESULT([$PHP_EMBED_TYPE])
-  PHP_SUBST_OLD(PHP_EMBED_TYPE)
+  AC_SUBST([PHP_EMBED_TYPE])
 else
   AC_MSG_RESULT(no)
 fi

sapi/fpm/config.m4

@@ -550,7 +550,7 @@ if test "$PHP_FPM" != "no"; then
     CFLAGS="$CFLAGS_save"
   fi
 
-  PHP_SUBST_OLD(php_fpm_systemd)
+  AC_SUBST([php_fpm_systemd])
   AC_DEFINE_UNQUOTED(PHP_FPM_SYSTEMD, "$php_fpm_systemd", [fpm systemd service type])
 
   if test -z "$PHP_FPM_USER" || test "$PHP_FPM_USER" = "yes" || test "$PHP_FPM_USER" = "no"; then
@@ -565,14 +565,14 @@ if test "$PHP_FPM" != "no"; then
     php_fpm_group="$PHP_FPM_GROUP"
   fi
 
-  PHP_SUBST_OLD(php_fpm_user)
-  PHP_SUBST_OLD(php_fpm_group)
+  AC_SUBST([php_fpm_user])
+  AC_SUBST([php_fpm_group])
   php_fpm_sysconfdir=`eval echo $sysconfdir`
-  PHP_SUBST_OLD(php_fpm_sysconfdir)
+  AC_SUBST([php_fpm_sysconfdir])
   php_fpm_localstatedir=`eval echo $localstatedir`
-  PHP_SUBST_OLD(php_fpm_localstatedir)
+  AC_SUBST([php_fpm_localstatedir])
   php_fpm_prefix=`eval echo $prefix`
-  PHP_SUBST_OLD(php_fpm_prefix)
+  AC_SUBST([php_fpm_prefix])
 
   AC_DEFINE_UNQUOTED(PHP_FPM_USER, "$php_fpm_user", [fpm user name])
   AC_DEFINE_UNQUOTED(PHP_FPM_GROUP, "$php_fpm_group", [fpm group name])