depends: Do not override CFLAGS when building SQLite with DEBUG=1

The `--enable-debug` configure option for the SQLite package does two
things. It adds three preprocessor definitions and overrides CFLAGS with
"-g -O0". The latter breaks the user's ability to provide sanitizer and
LTO flags.

depends/packages/sqlite.mk

@@ -11,7 +11,9 @@ $(package)_config_opts_linux=--with-pic
 $(package)_config_opts_freebsd=--with-pic
 $(package)_config_opts_netbsd=--with-pic
 $(package)_config_opts_openbsd=--with-pic
-$(package)_config_opts_debug=--enable-debug
+# We avoid using `--enable-debug` because it overrides CFLAGS, a behavior we want to prevent.
+$(package)_cflags_debug += -g
+$(package)_cppflags_debug += -DSQLITE_DEBUG
 $(package)_cppflags+=-DSQLITE_DQS=0 -DSQLITE_DEFAULT_MEMSTATUS=0 -DSQLITE_OMIT_DEPRECATED
 $(package)_cppflags+=-DSQLITE_OMIT_SHARED_CACHE -DSQLITE_OMIT_JSON -DSQLITE_LIKE_DOESNT_MATCH_BLOBS
 $(package)_cppflags+=-DSQLITE_OMIT_DECLTYPE -DSQLITE_OMIT_PROGRESS_CALLBACK -DSQLITE_OMIT_AUTOINIT