Fixes the Makefile template to link .so.<MAJOR_VERSION>

This resolves a blocker stopping a clean linuxbrew install to work with one of
the wrapped libraries.

Makefile

@@ -2167,6 +2167,7 @@ else
 	$(Q) $(INSTALL) -d $(prefix)/lib
 	$(Q) $(INSTALL) $(LIBDIR)/$(CONFIG)/libgpr.$(SHARED_EXT) $(prefix)/lib/libgpr.$(SHARED_EXT)
 ifneq ($(SYSTEM),Darwin)
+	$(Q) ln -sf libgpr.$(SHARED_EXT) $(prefix)/lib/libgpr.so.0
 	$(Q) ln -sf libgpr.$(SHARED_EXT) $(prefix)/lib/libgpr.so
 endif
 endif
@@ -2180,6 +2181,7 @@ else
 	$(Q) $(INSTALL) -d $(prefix)/lib
 	$(Q) $(INSTALL) $(LIBDIR)/$(CONFIG)/libgrpc.$(SHARED_EXT) $(prefix)/lib/libgrpc.$(SHARED_EXT)
 ifneq ($(SYSTEM),Darwin)
+	$(Q) ln -sf libgrpc.$(SHARED_EXT) $(prefix)/lib/libgrpc.so.0
 	$(Q) ln -sf libgrpc.$(SHARED_EXT) $(prefix)/lib/libgrpc.so
 endif
 endif
@@ -2193,6 +2195,7 @@ else
 	$(Q) $(INSTALL) -d $(prefix)/lib
 	$(Q) $(INSTALL) $(LIBDIR)/$(CONFIG)/libgrpc_unsecure.$(SHARED_EXT) $(prefix)/lib/libgrpc_unsecure.$(SHARED_EXT)
 ifneq ($(SYSTEM),Darwin)
+	$(Q) ln -sf libgrpc_unsecure.$(SHARED_EXT) $(prefix)/lib/libgrpc_unsecure.so.0
 	$(Q) ln -sf libgrpc_unsecure.$(SHARED_EXT) $(prefix)/lib/libgrpc_unsecure.so
 endif
 endif
@@ -2214,6 +2217,7 @@ else
 	$(Q) $(INSTALL) -d $(prefix)/lib
 	$(Q) $(INSTALL) $(LIBDIR)/$(CONFIG)/libgrpc++.$(SHARED_EXT) $(prefix)/lib/libgrpc++.$(SHARED_EXT)
 ifneq ($(SYSTEM),Darwin)
+	$(Q) ln -sf libgrpc++.$(SHARED_EXT) $(prefix)/lib/libgrpc++.so.0
 	$(Q) ln -sf libgrpc++.$(SHARED_EXT) $(prefix)/lib/libgrpc++.so
 endif
 endif
@@ -2227,6 +2231,7 @@ else
 	$(Q) $(INSTALL) -d $(prefix)/lib
 	$(Q) $(INSTALL) $(LIBDIR)/$(CONFIG)/libgrpc++_unsecure.$(SHARED_EXT) $(prefix)/lib/libgrpc++_unsecure.$(SHARED_EXT)
 ifneq ($(SYSTEM),Darwin)
+	$(Q) ln -sf libgrpc++_unsecure.$(SHARED_EXT) $(prefix)/lib/libgrpc++_unsecure.so.0
 	$(Q) ln -sf libgrpc++_unsecure.$(SHARED_EXT) $(prefix)/lib/libgrpc++_unsecure.so
 endif
 endif
@@ -2248,6 +2253,7 @@ else
 	$(Q) $(INSTALL) -d $(prefix)/lib
 	$(Q) $(INSTALL) $(LIBDIR)/$(CONFIG)/libgrpc_csharp_ext.$(SHARED_EXT) $(prefix)/lib/libgrpc_csharp_ext.$(SHARED_EXT)
 ifneq ($(SYSTEM),Darwin)
+	$(Q) ln -sf libgrpc_csharp_ext.$(SHARED_EXT) $(prefix)/lib/libgrpc_csharp_ext.so.0
 	$(Q) ln -sf libgrpc_csharp_ext.$(SHARED_EXT) $(prefix)/lib/libgrpc_csharp_ext.so
 endif
 endif

templates/Makefile.template

@@ -930,6 +930,7 @@ else
 	$(Q) $(INSTALL) -d $(prefix)/lib
 	$(Q) $(INSTALL) $(LIBDIR)/$(CONFIG)/lib${lib.name}.$(SHARED_EXT) $(prefix)/lib/lib${lib.name}.$(SHARED_EXT)
 ifneq ($(SYSTEM),Darwin)
+	$(Q) ln -sf lib${lib.name}.$(SHARED_EXT) $(prefix)/lib/lib${lib.name}.so.${settings.version.major}
 	$(Q) ln -sf lib${lib.name}.$(SHARED_EXT) $(prefix)/lib/lib${lib.name}.so
 endif
 endif