-Build static library as well

Index: pm_common/CMakeLists.txt
--- pm_common/CMakeLists.txt.orig
+++ pm_common/CMakeLists.txt
@@ -37,9 +37,10 @@ set(PM_LIB_PUBLIC_SRC ${PMDIR}/pm_common/portmidi.c
                       ${PMDIR}/pm_common/pmutil.c
                       ${PMDIR}/porttime/porttime.c)
 add_library(portmidi ${PM_LIB_PUBLIC_SRC})
+add_library(portmidi_s STATIC ${PM_LIB_PUBLIC_SRC})
 
 # MSVCRT_DLL is "DLL" for shared runtime library, and "" for static:
-set_target_properties(portmidi PROPERTIES
+set_target_properties(portmidi portmidi_s PROPERTIES
                       VERSION ${LIBRARY_VERSION}
                       SOVERSION ${LIBRARY_SOVERSION}
                       OUTPUT_NAME "${PM_ACTUAL_LIB_NAME}"
