allow for header in sqlcipher folder

Author: MSP-Greg

.github/workflows/sqlite3-ruby.yml

@@ -101,6 +101,6 @@ jobs:
           apt-get: "libsqlcipher-dev"
           brew: "sqlcipher"
           mingw: "sqlcipher"
-          vcpkg: "sqlite3 sqlcipher"
+          vcpkg: "sqlcipher"
       - run: bundle exec rake compile -- --with-sqlcipher
       - run: bundle exec rake test

ext/sqlite3/extconf.rb

@@ -78,7 +78,14 @@ def configure_extension
           append_cflags("-DTAINTING_SUPPORT")
         end
 
-        abort_could_not_find("sqlite3.h") unless find_header("sqlite3.h")
+        if find_header("sqlite3.h")
+          # noop
+        elsif find_header("#{libname}/sqlite3.h")
+          $defs.push "-DHAVE_LIB_FLDR"
+        else
+          abort_could_not_find("sqlite3.h")
+        end
+
         abort_could_not_find(libname) unless find_library(libname, "sqlite3_libversion_number", "sqlite3.h")
 
         # double-check that we're using the expected library (sqlite3 or sqlcipher)

ext/sqlite3/sqlite3_ruby.h

@@ -21,8 +21,11 @@
 #define SQLITE3_UTF8_STR_NEW2(_obj) \
     (rb_enc_associate_index(rb_str_new2(_obj), rb_utf8_encindex()))
 
-
+#ifdef HAVE_LIB_FLDR  /* only occurs with sqlcipher? */
+#include <sqlcipher/sqlite3.h>
+#else
 #include <sqlite3.h>
+#endif
 
 #ifndef HAVE_TYPE_SQLITE3_INT64
 typedef sqlite_int64 sqlite3_int64;