SQLite thread support

[ChrisW67]

src/3rdparty/sqlite.pri after running a default configure (Qt 4.8.4 on Linux):

CONFIG(release, debug|release):DEFINES *= NDEBUG
DEFINES += SQLITE_OMIT_LOAD_EXTENSION SQLITE_OMIT_COMPLETE
blackberry: DEFINES += SQLITE_ENABLE_FTS3 SQLITE_ENABLE_FTS3_PARENTHESIS SQLITE_ENABLE_RTREE
wince*: DEFINES += HAVE_LOCALTIME_S=0
INCLUDEPATH +=  $$PWD/sqlite
SOURCES +=      $$PWD/sqlite/sqlite3.c

CONFIG(release, debug|release):DEFINES *= NDEBUG
DEFINES += SQLITE_OMIT_LOAD_EXTENSION SQLITE_OMIT_COMPLETE
blackberry: DEFINES += SQLITE_ENABLE_FTS3 SQLITE_ENABLE_FTS3_PARENTHESIS SQLITE_ENABLE_RTREE
wince*: DEFINES += HAVE_LOCALTIME_S=0
INCLUDEPATH +=  $$PWD/sqlite
SOURCES +=      $$PWD/sqlite/sqlite3.c

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My money is on the default SQLITE_THREADSAFE = 1