Removed hardcoded optimizations.

Index: configure
--- configure.orig
+++ configure
@@ -236,7 +236,6 @@ esac
 tryflag CFLAGS -pipe
 
 # Try flags to optimize binary size
-tryflag CFLAGS -O2
 tryflag CFLAGS -ffunction-sections
 tryflag CFLAGS -fdata-sections
 tryldflag LDFLAGS_AUTO -Wl,--gc-sections
@@ -443,7 +442,7 @@ int main(int argc, char *argv[]) {
 }
 EOF
 
-	for liblua in lua lua5.4 lua5.3 lua5.2 lua-5.3 lua-5.2 lua54 lua53 lua52; do
+	for liblua in $LUA_VER; do
 		printf " checking for %s... " "$liblua"
 
 		if test "$have_pkgconfig" = "yes" ; then