Autotools: Refactor dmalloc check

- AC_SEARCH_LIBS automatically appends the library to the LIBS
- AS_VAR_APPEND used for enabling Dmalloc check-funcs token
- CS synced

configure.ac

@@ -1002,15 +1002,11 @@ PHP_ARG_ENABLE([dmalloc],
  [no],
  [no])
 
-if test "$PHP_DMALLOC" = "yes"; then
- AC_CHECK_LIB(dmalloc, dmalloc_error, [
- PHP_ADD_LIBRARY(dmalloc)
- AC_DEFINE(HAVE_DMALLOC,1,[Whether you have dmalloc])
- CPPFLAGS="$CPPFLAGS -DDMALLOC_FUNC_CHECK"
- ], [
- AC_MSG_ERROR([Problem with enabling dmalloc. Please check config.log for details.])
- ])
-fi
+AS_VAR_IF([PHP_DMALLOC], [yes],
+ [AC_SEARCH_LIBS([dmalloc_error], [dmalloc],
+ [AC_DEFINE([HAVE_DMALLOC], [1], [Define to 1 if you have dmalloc.])
+ AS_VAR_APPEND([CPPFLAGS], [" -DDMALLOC_FUNC_CHECK"])],
+ [AC_MSG_ERROR([Problem with enabling dmalloc. Please, check config.log for details.])])])
 
 PHP_ARG_ENABLE([ipv6],
  [whether to enable IPv6 support],