PCRE unit tests failed on Ubuntu Precise, because "source"
is not a known command in "dash" (the default shell in Precise).
Changing "source" to ".", which should be understood in all shells.
libmysqld.a(pcre_exec.c.o): relocation R_X86_64_32S against
`_pcre_ucd_stage1' can not be used when making a shared object;
make[2]: Leaving directory `/mnt/buildbot/build/mariadb-10.0.3'
recompile with -fPIC
Changing ADD_LIBRARY(pcre) to ADD_CONVENIENCE_LIBRARY(pcre)