Merge pull request 'Add support for static only build' (#254) from ffontaine/master into master

Reviewed-on: http://localhost:8888/hramrach/lm-sensors/pulls/254

Makefile

@@ -93,6 +93,9 @@ ARCH := $(firstword $(subst -, ,$(shell $(CC) -dumpmachine)))
 # Build and install static library
 BUILD_STATIC_LIB := 1
 
+# Build and install shared library
+BUILD_SHARED_LIB := 1
+
 # Set these to add preprocessor or compiler flags, or use
 # environment variables
 # CFLAGS :=