Added a compile time flag to compile SQLite with builtin math funcions

Author: francesco-cattoglio

.cargo/config.toml

@@ -0,0 +1,4 @@
+[env]
+# To use built-in math functions, this compile time flag must be set
+# See https://www.sqlite.org/draft/lang_mathfunc.html as a reference
+LIBSQLITE3_FLAGS = { value = "-DSQLITE_ENABLE_MATH_FUNCTIONS", force=true }