lua54: avoid conditional usage of -Os

The CMCFLAGS variable in Lua 5.4's Makefile specifies -Os by
default, apparently to shrink the code size of certain files.
However, at least on my machine that causes issues with valgrind,
rendering it practically unusable through hundreds of messages
about uninitialized memory.

srcpkgs/lua54/template

@@ -1,7 +1,7 @@
 # Template file for 'lua54'
 pkgname=lua54
 version=5.4.0
-revision=1
+revision=2
 wrksrc=lua-${version}
 makedepends="ncurses-devel readline-devel"
 short_desc="Powerful, fast, lightweight, embeddable scripting language (5.4.x)"
@@ -24,7 +24,7 @@ do_build() {
 		-e '/^LUA_(SO|A|T)=/ s;lua;lua5.4;' \
 		-e '/^LUAC_T=/ s;luac;luac5.4;'
 	make MYCFLAGS="$CFLAGS -fPIC" MYLDFLAGS="$LDFLAGS" \
-		CC="$CC" RANLIB="$RANLIB" \
+		CMCFLAGS="" CC="$CC" RANLIB="$RANLIB" \
 		INSTALL_DATA="cp -d" LUA_SO=liblua5.4.so ${makejobs} linux-readline
 }