Use C++ linker if ICU is disabled

Bug 54948 - Undefined symbols: "operator delete(void*)" "operator
new(unsigned long)" "___cxa_pure_virtual"

src/Makefile.am

diff --git a/src/Makefile.am b/src/Makefile.am
index b7896bf..558ce08 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -195,9 +195,13 @@
 harfbuzz_def_dependency = harfbuzz.def
 libharfbuzz_la_LINK = $(CXXLINK) $(libharfbuzz_la_LDFLAGS)
 else
+if HAVE_ICU
+libharfbuzz_la_LINK = $(CXXLINK) $(libharfbuzz_la_LDFLAGS)
+else
 # Use a C linker, not C++; Don't link to libstdc++
 libharfbuzz_la_LINK = $(LINK) $(libharfbuzz_la_LDFLAGS)
 endif
+endif
 
 libharfbuzz_la_SOURCES = $(HBSOURCES) $(HBHEADERS)
 nodist_libharfbuzz_la_SOURCES = $(nodist_HBSOURCES)