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: Iad7753b8e6a80307ad57a9a6dd2d442ec7fe0e67
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/configure.ac b/configure.ac
index 6bfb254..0c8fc09 100644
--- a/configure.ac
+++ b/configure.ac
@@ -13,36 +13,11 @@
 AC_PROG_MAKE_SET
 
 # Checks for libraries.
-PKG_CHECK_MODULES(
-    [SDBUSPLUS],
-    [sdbusplus],
-    [],
-    [AC_MSG_ERROR(["sdbusplus required and not found."])]
-)
-PKG_CHECK_MODULES(
-    [SDEVENTPLUS],
-    [sdeventplus],
-    [],
-    [AC_MSG_ERROR(["sdeventplus required and not found."])]
-)
-PKG_CHECK_MODULES(
-    [PHOSPHOR_DBUS_INTERFACES],
-    [phosphor-dbus-interfaces],
-    [],
-    [AC_MSG_ERROR(["phosphor-dbus-interfaces required and not found."])]
-)
-PKG_CHECK_MODULES(
-    [PHOSPHOR_LOGGING],
-    [phosphor-logging],
-    [],
-    [AC_MSG_ERROR(["phosphor-logging required and not found."])]
-)
-PKG_CHECK_MODULES(
-    [GPIOPLUS],
-    [gpioplus],
-    [],
-    [AC_MSG_ERROR([Could not find gpioplus...openbmc/gpioplus package required])]
-)
+PKG_CHECK_MODULES([SDBUSPLUS], [sdbusplus])
+PKG_CHECK_MODULES([SDEVENTPLUS], [sdeventplus])
+PKG_CHECK_MODULES([PHOSPHOR_DBUS_INTERFACES], [phosphor-dbus-interfaces])
+PKG_CHECK_MODULES([PHOSPHOR_LOGGING], [phosphor-logging])
+PKG_CHECK_MODULES([GPIOPLUS], [gpioplus])
 AX_PTHREAD([], [AC_MSG_ERROR(["pthread required and not found"])])
 
 # Checks for typedefs, structures, and compiler characteristics.