remove Fraction pretty-printer

no longer necessary after
    commit 31589bf0239679d73417902655045c48c4868016
    Date:   Mon Jun 24 15:02:55 2019 +0200
    tdf#94677 Calc is slow opening large CSV, improve tools::Fraction

Change-Id: I1c9ee043a51216f7005bf8a4bf60bb4b4e39ab61
diff --git a/solenv/gdb/libreoffice/tl.py b/solenv/gdb/libreoffice/tl.py
index 44f3c78..22ca3ba 100644
--- a/solenv/gdb/libreoffice/tl.py
+++ b/solenv/gdb/libreoffice/tl.py
@@ -53,29 +53,6 @@ class ColorPrinter(object):
        else:
            return "rgb(%d, %d, %d)" % (r, g, b)

class FractionPrinter(object):
    '''Prints fraction'''

    def __init__(self, typename, val):
        self.typename = typename
        self.val = val

    def to_string(self):
        # Workaround gdb bug <https://sourceware.org/bugzilla/show_bug.cgi?id=22968> "ptype does not
        #     find inner C++ class type without -readnow"
        gdb.lookup_type('Fraction')
        # This would be simpler and more reliable if we could call the operator* on mpImpl to get the internal Impl.
        # Different libc have different structures. Some have one _M_t, some have two nested.
        tmp = self.val['mpImpl']['_M_t']
        if tmp.type.fields()[0].name == '_M_t': tmp = tmp['_M_t']
        impl = tmp['_M_head_impl'].dereference().cast(gdb.lookup_type('Fraction::Impl'))
        numerator = impl['value']['num']
        denominator = impl['value']['den']
        if impl['valid']:
            return "%d/%d" % (numerator, denominator)
        else:
            return "invalid %s %d/%d" % (self.typename, numerator, denominator)

class DateTimeImpl(object):

    def __init__(self, date, time):
@@ -228,7 +205,6 @@ def build_pretty_printers():
    # various types
    printer.add('BigInt', BigIntPrinter)
    printer.add('Color', ColorPrinter)
    printer.add('Fraction', FractionPrinter)
    printer.add('DateTime', DateTimePrinter)
    printer.add('Date', DatePrinter)
    printer.add('Time', TimePrinter)