build: Make library minor version visible in the Makefile

This allows employing that number in library install commands.

configure

@@ -3958,6 +3958,7 @@ get_version(){
     eval ${name}_VERSION=\$${name}_VERSION_MAJOR.\$${name}_VERSION_MINOR.\$${name}_VERSION_MICRO
     eval echo "${lcname}_VERSION=\$${name}_VERSION" >> config.mak
     eval echo "${lcname}_VERSION_MAJOR=\$${name}_VERSION_MAJOR" >> config.mak
+    eval echo "${lcname}_VERSION_MINOR=\$${name}_VERSION_MINOR" >> config.mak
 }
 
 map 'get_version $v' $LIBRARY_LIST

library.mak

@@ -4,6 +4,7 @@ include $(SRC_PATH)/common.mak
 
 LIBVERSION := $(lib$(NAME)_VERSION)
 LIBMAJOR   := $(lib$(NAME)_VERSION_MAJOR)
+LIBMINOR   := $(lib$(NAME)_VERSION_MINOR)
 INCINSTDIR := $(INCDIR)/lib$(NAME)
 
 INSTHEADERS := $(INSTHEADERS) $(HEADERS:%=$(SUBDIR)%)