Extract use_system_foo logic out of gyp files, patch 2

build/linux/unbundle/sqlite.gyp

Index: build/linux/unbundle/sqlite.gyp
diff --git a/build/linux/unbundle/harfbuzz.gyp b/build/linux/unbundle/sqlite.gyp
similarity index 59%
copy from build/linux/unbundle/harfbuzz.gyp
copy to build/linux/unbundle/sqlite.gyp
index 456dd384df2d5c57d9857cfb775d46ef87add2bc..918da92801890c6fec27d2d3ea448335bb78db03 100644
--- a/build/linux/unbundle/harfbuzz.gyp
+++ b/build/linux/unbundle/sqlite.gyp
@@ -5,22 +5,22 @@
 {
   'targets': [
     {
-      'target_name': 'harfbuzz-ng',
+      'target_name': 'sqlite',
       'type': 'none',
-      'cflags': [
-        '<!@(pkg-config --cflags harfbuzz)',
-      ],
       'direct_dependent_settings': {
         'cflags': [
-          '<!@(pkg-config --cflags harfbuzz)',
+          '<!@(pkg-config --cflags sqlite3)',
+        ],
+        'defines': [
+          'USE_SYSTEM_SQLITE',
         ],
       },
       'link_settings': {
         'ldflags': [
-          '<!@(pkg-config --libs-only-L --libs-only-other harfbuzz)',
+          '<!@(pkg-config --libs-only-L --libs-only-other sqlite3)',
         ],
         'libraries': [
-          '<!@(pkg-config --libs-only-l harfbuzz)',
+          '<!@(pkg-config --libs-only-l sqlite3)',
         ],
       },
     },