Remove hts_probe_cc.sh and don't try to run it from Makefile

Pysam always runs configure, so we don't need or want this.
It was being run by `make distclean` on an otherwise clean directory
(and failing from an sdist, which didn't include hts_probe_cc.sh),
so use `-include` to avoid trying to rebuild it in this case.
Hat tip @nsoranzo.

htslib/Makefile

@@ -115,13 +115,6 @@ all: lib-static lib-shared $(BUILT_PROGRAMS) plugins $(BUILT_TEST_PROGRAMS) \
 
 ALL_CPPFLAGS = -I. $(CPPFLAGS)
 
-# Usually htscodecs.mk is generated by running configure or config.status,
-# but if those aren't used create a default here.
-htscodecs.mk:
-	echo '# Default htscodecs.mk generated by Makefile' > $@
-	echo 'include $$(HTSPREFIX)htscodecs_bundled.mk' >> $@
-	$(srcdir)/hts_probe_cc.sh '$(CC)' '$(CFLAGS) $(CPPFLAGS)' '$(LDFLAGS)' >> $@
-
 srcdir = .
 srcprefix =
 HTSPREFIX =
@@ -139,7 +132,7 @@ HTS_BUILD_POPCNT =
 HTS_BUILD_SSE4_1 =
 
 include htslib_vars.mk
-include htscodecs.mk
+-include htscodecs.mk
 
 # If not using GNU make, you need to copy the version number from version.sh
 # into here.