pph: include speexdsp_types.h, not speex_types.h

pph: include speexdsp_types.h, not speex_types.h

Speexdsp was separated from speex in 1.2rc2. speex_types.h is not
shipped by speexdsp, so alsa-plugins shouldn't use that file. speexdsp
has speexdsp_types.h, which has the same contents as speex_types.h.

speexdsp_types.h is a new file introduced in 1.2rc2, so this change
bumps the minimum supported speexdsp version. The version check in
configure.ac will actually break if speexdsp 1.2 ever gets released,
because pkg-config thinks that "1.2" < "1.2rc2", but I think it's
useful to fail if the installed speexdsp version is 1.2rc1 (which I
believe is very common on current distributions). If a non-rc version
of speexdsp will ever get released, I hope version number 1.2 will be
skipped for this reason. (A non-rc version seems unlikely, since
1.2rc1 was released years ago, so it's pretty likely that the project
is stuck on so called "release candidates" forever...)

Signed-off-by: Tanu Kaskinen <tanu.kaskinen@linux.intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>