Change to use $(CC) instead of $(FC), as we no longer have fortran in this repo

Makefile

@@ -26,7 +26,7 @@ all: libopenlibm.a libopenlibm.$(SHLIB_EXT)
 libopenlibm.a: $(OBJS)  
 	$(AR) -rcs libopenlibm.a $(OBJS)
 libopenlibm.$(SHLIB_EXT): $(OBJS)
-	$(FC) -shared $(OBJS) $(LDFLAGS) -Wl,$(SONAME_FLAG),libopenlibm.$(SHLIB_EXT).$(VERSION) -o libopenlibm.$(SHLIB_EXT).$(VERSION)
+	$(CC) -shared $(OBJS) $(LDFLAGS) -Wl,$(SONAME_FLAG),libopenlibm.$(SHLIB_EXT).$(VERSION) -o libopenlibm.$(SHLIB_EXT).$(VERSION)
 	@-ln -sf libopenlibm.$(SHLIB_EXT).$(VERSION) libopenlibm.$(SHLIB_EXT).$(word 1,$(VERSION_SPLIT)).$(word 2,$(VERSION_SPLIT))
 	@-ln -sf libopenlibm.$(SHLIB_EXT).$(VERSION) libopenlibm.$(SHLIB_EXT).$(word 1,$(VERSION_SPLIT))
 	@-ln -sf libopenlibm.$(SHLIB_EXT).$(VERSION) libopenlibm.$(SHLIB_EXT)