rename rosfmt library to rosfmt7 to prevent ABI mismatches

I'd like to use proper library versioning, but that doesn't play well
with catkin (see ros/catkin#1126).

CMakeLists.txt

@@ -50,7 +50,7 @@ add_custom_target(fmt_headers
 catkin_package(
 	INCLUDE_DIRS include ${fmt_HEADER_DEST}
 	CATKIN_DEPENDS roscpp rosconsole
-	LIBRARIES rosfmt
+	LIBRARIES rosfmt7
 )
 
 include_directories(
@@ -67,21 +67,21 @@ set_source_files_properties(
 	PROPERTIES GENERATED TRUE
 )
 
-add_library(rosfmt
+add_library(rosfmt7
 	${fmt_HEADERS_OUT}
 	${fmt_SOURCE_DIR}/src/format.cc
 	${fmt_SOURCE_DIR}/src/os.cc
 	src/rosfmt.cpp
 )
-target_link_libraries(rosfmt
+target_link_libraries(rosfmt7
 	${catkin_LIBRARIES}
 )
-add_dependencies(rosfmt fmt fmt_headers)
+add_dependencies(rosfmt7 fmt fmt_headers)
 
 add_executable(simple_test
 	test/test.cpp
 )
-target_link_libraries(simple_test rosfmt)
+target_link_libraries(simple_test rosfmt7)
 
 install(
 	DIRECTORY ${fmt_HEADER_DEST}/fmt/
@@ -92,6 +92,6 @@ install(
 	DESTINATION ${CATKIN_PACKAGE_INCLUDE_DESTINATION}
 )
 install(
-	TARGETS rosfmt
+	TARGETS rosfmt7
 	DESTINATION ${CATKIN_PACKAGE_LIB_DESTINATION}
 )