8014231: --with-alsa configuration options don't add include or lib directories to proper flags

Reviewed-by: tbell

common/autoconf/spec.gmk.in

@@ -275,6 +275,8 @@ FREETYPE2_LIBS:=@FREETYPE2_LIBS@
 FREETYPE2_CFLAGS:=@FREETYPE2_CFLAGS@
 USING_SYSTEM_FT_LIB=@USING_SYSTEM_FT_LIB@
 CUPS_CFLAGS:=@CUPS_CFLAGS@
+ALSA_LIBS:=@ALSA_LIBS@
+ALSA_CFLAGS:=@ALSA_CFLAGS@
 
 PACKAGE_PATH=@PACKAGE_PATH@