Allow libharfbuzz-subset to link to libstdc++

We want to use it instead of reinventing hashmap...

Also, don't change linker for ICU since libicu also uses libstdc++.

src/Makefile.am

@@ -154,7 +154,6 @@ pkgconfig_DATA = harfbuzz.pc
 EXTRA_DIST += harfbuzz.pc.in
 
 lib_LTLIBRARIES += libharfbuzz-subset.la
-libharfbuzz_subset_la_LINK = $(chosen_linker) $(libharfbuzz_subset_la_LDFLAGS)
 libharfbuzz_subset_la_SOURCES = $(HB_SUBSET_sources)
 libharfbuzz_subset_la_CPPFLAGS = $(libharfbuzz_la_CPPFLAGS)
 libharfbuzz_subset_la_LDFLAGS = $(base_link_flags) $(export_symbols_subset)
@@ -192,7 +191,6 @@ HBSOURCES += $(HB_ICU_sources)
 HBHEADERS += $(HB_ICU_headers)
 else
 lib_LTLIBRARIES += libharfbuzz-icu.la
-libharfbuzz_icu_la_LINK = $(chosen_linker) $(libharfbuzz_icu_la_LDFLAGS)
 libharfbuzz_icu_la_SOURCES = $(HB_ICU_sources)
 libharfbuzz_icu_la_CPPFLAGS = $(libharfbuzz_la_CPPFLAGS) $(ICU_CFLAGS)
 libharfbuzz_icu_la_LDFLAGS = $(base_link_flags) $(export_symbols_icu)

src/check-libstdc++.sh

@@ -22,7 +22,8 @@ fi
 
 tested=false
 # harfbuzz-icu links to libstdc++ because icu does.
-for soname in harfbuzz harfbuzz-subset harfbuzz-gobject; do
+# harfbuzz-subset uses libstdc++.
+for soname in harfbuzz harfbuzz-gobject; do
 	for suffix in so dylib; do
 		so=$libs/lib$soname.$suffix
 		if ! test -f "$so"; then continue; fi