cmdpad: Fix compilation with musl

When passing -Wimplicit-function-declaration

Also got rid of std=gnu89. It's easy to patch out.

Signed-off-by: Rosen Penev <rosenp@gmail.com>
(cherry-picked from 1b5e4883a4)

utils/cmdpad/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=cmdpad
 PKG_VERSION:=0.0.3
-PKG_RELEASE:=4
+PKG_RELEASE:=5
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tgz
 PKG_SOURCE_URL:=@SF/cmdpad
@@ -28,8 +28,6 @@ define Package/cmdpad
   URL:=http://cmdpad.sourceforge.net/index.php
 endef
 
-TARGET_CFLAGS += -std=gnu89
-
 CONFIGURE_ARGS += \
 	--enable-static \
 	--enable-shared