pkgs/development/libraries/sqlite/default.nix: enable amalgamation build

Sqlite has a build mode called "amalgamation" that gathers all 90+ source code
files into a single sqlite3.c file before compiling the library. Building
sqlite this way reportedly gives a 5-10% performance gain because the compiler
can perform more sophisticated optimizations.

svn path=/nixpkgs/trunk/; revision=18092

pkgs/development/libraries/sqlite/default.nix

@@ -13,9 +13,10 @@ stdenv.mkDerivation rec {
   buildInputs = [readline tcl];
 
   configureFlags = ''
+    CFLAGS=-O3
     --enable-load-extension
     ${if static then "--disable-shared --enable-static" else ""}
-    --disable-amalgamation
+    --enable-amalgamation
     --enable-threadsafe
     --disable-cross-thread-connections
     --disable-tcl