[automake] add CMakeLists.txt to EXTRA_DIST

Makefile.am

@@ -31,4 +31,4 @@ rtaudio_inc_HEADERS = \
 pkgconfigdatadir = $(libdir)/pkgconfig
 pkgconfigdata_DATA = rtaudio.pc
 
-EXTRA_DIST = autogen.sh README.md install.txt contrib include cmake
+EXTRA_DIST = autogen.sh README.md install.txt contrib include cmake CMakeLists.txt

tests/Makefile.am

@@ -27,4 +27,4 @@ testall_LDADD = $(top_builddir)/librtaudio.la
 teststops_SOURCES = teststops.cpp
 teststops_LDADD = $(top_builddir)/librtaudio.la
 
-EXTRA_DIST = Windows
+EXTRA_DIST = Windows CMakeLists.txt