configure: remove HOST_CC

$(HOST_CC) is only used to invoke the preprocessor, and $(CC) can be
used instead now that there is a Tricore C compiler.  Remove the variable
from config-host.mak.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/configure b/configure
index b9af828..7743c18 100755
--- a/configure
+++ b/configure
@@ -1800,7 +1800,6 @@
 mkdir -p tests/tcg
 echo "# Automatically generated by configure - do not modify" > $config_host_mak
 echo "SRC_PATH=$source_path" >> $config_host_mak
-echo "HOST_CC=$host_cc" >> $config_host_mak
 
 # versioned checked in the main config_host.mak above
 if test -n "$gdb_bin"; then
diff --git a/tests/tcg/tricore/Makefile.softmmu-target b/tests/tcg/tricore/Makefile.softmmu-target
index aff7c1b..2ec0bd3 100644
--- a/tests/tcg/tricore/Makefile.softmmu-target
+++ b/tests/tcg/tricore/Makefile.softmmu-target
@@ -28,7 +28,7 @@
 QEMU_OPTS += -M tricore_testboard -cpu tc27x -nographic -kernel
 
 %.pS: $(ASM_TESTS_PATH)/%.S
-	$(HOST_CC) -E -o $@ $<
+	$(CC) -E -o $@ $<
 
 %.o: %.pS
 	$(AS) $(ASFLAGS) -o $@ $<