build: pkg anti-pattern: use defaults

Use the defaults in the pkg check where the default error message is
sufficient to identify which package is missing.

Change-Id: Iaa5325492d937899c06a5aecad9b6d1beaa81897
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/configure.ac b/configure.ac
index 471a7be..4f96c96 100644
--- a/configure.ac
+++ b/configure.ac
@@ -30,15 +30,13 @@
 AC_CHECK_LIB([mapper], [mapper_get_service], ,[AC_MSG_ERROR([Could not find libmapper...openbmc/phosphor-objmgr package required])])
 PKG_CHECK_MODULES([SYSTEMD], [libsystemd >= 221], [], [AC_MSG_ERROR(["systemd required and not found"])])
 PKG_CHECK_MODULES([CRYPTO], [libcrypto >= 1.0.2g], ,[AC_MSG_ERROR([can't find openssl libcrypto])])
-PKG_CHECK_MODULES([PHOSPHOR_LOGGING], [phosphor-logging],, [AC_MSG_ERROR([Could not find phosphor-logging...openbmc/phosphor-logging package required])])
-PKG_CHECK_MODULES([PHOSPHOR_DBUS_INTERFACES], [phosphor-dbus-interfaces],, [AC_MSG_ERROR([Could not find phosphor-dbus-interfaces...openbmc/phosphor-dbus-interfaces package required])])
-PKG_CHECK_MODULES([SDBUSPLUS], [sdbusplus],,\
-    AC_MSG_ERROR(["Requires sdbusplus package."]))
+PKG_CHECK_MODULES([PHOSPHOR_LOGGING], [phosphor-logging])
+PKG_CHECK_MODULES([PHOSPHOR_DBUS_INTERFACES], [phosphor-dbus-interfaces])
+PKG_CHECK_MODULES([SDBUSPLUS], [sdbusplus])
 AC_CHECK_HEADER(nlohmann/json.hpp, [], [AC_MSG_ERROR([Could not find nlohmann/json.hpp])])
 
 AS_IF([test "x$enable_softoff" != "xno"], [
-    PKG_CHECK_MODULES([SDEVENTPLUS], [sdeventplus],,\
-        AC_MSG_ERROR(["Requires sdeventplus package."]))
+    PKG_CHECK_MODULES([SDEVENTPLUS], [sdeventplus])
 
     # Check for sdbus++ tool
     AC_PATH_PROG([SDBUSPLUSPLUS], [sdbus++])