Fix GEOS dev detection (fixes #11081)

Author: jef-n

cmake/FindGEOS.cmake

@@ -158,7 +158,7 @@ ENDIF(WIN32)
 
 IF(GEOS_INCLUDE_DIR AND NOT GEOS_VERSION)
   FILE(READ ${GEOS_INCLUDE_DIR}/geos_c.h VERSIONFILE)
-  STRING(REGEX MATCH "#define GEOS_VERSION \"[0-9]+\\.[0-9]+\\.[0-9]+\"" GEOS_VERSION ${VERSIONFILE})
+  STRING(REGEX MATCH "#define GEOS_VERSION \"[0-9]+\\.[0-9]+\\.[0-9]+(dev)?\"" GEOS_VERSION ${VERSIONFILE})
   STRING(REGEX MATCH "[0-9]+\\.[0-9]\\.[0-9]+" GEOS_VERSION ${GEOS_VERSION})
 ENDIF(GEOS_INCLUDE_DIR AND NOT GEOS_VERSION)