Add ability to build GnuCash with CMake

Backported from master.

doc/examples/CMakeLists.txt

@@ -0,0 +1,24 @@
+
+
+SET(examples_DATA
+  Money95bank_fr.qif
+  Money95invst_fr.qif
+  Money95mfunds_fr.qif
+  Money95stocks_fr.qif
+  README
+  README_invoice
+  abc-all.qif
+  abc.qif
+  bogus.qif
+  cbb-export.qif
+  currency_tree_xml.gnucash
+  every.qif
+  invoice.csv
+  ms-money.qif
+  quicktest.qif
+  swipe.qif
+  taxreport.gnucash
+  web.qif
+)
+
+INSTALL(FILES ${examples_DATA} DESTINATION share/doc/gnucash)