disable hard dependency on libjpeg
disable hard dependency on libjpeg

cneira/cocotron,crystax/android-vendor-cocotron,JackLian/cocotron,cyclaero/cocotron,yuhangwang/cocotron,Suninus/cocotron,yuhangwang/cocotron,cjwl/cocotron,Suninus/cocotron,cneira/cocotron,ruppmatt/cocotron,gemu2015/cocotron-sierra,Suninus/cocotron,gemu2015/cocotron-sierra,cyclaero/cocotron,cneira/cocotron,ruppmatt/cocotron,JackLian/cocotron,guestOS/guestOS,Suninus/cocotron,plasq/cocotron,guestOS/guestOS,crystax/android-vendor-cocotron,ruppmatt/cocotron,plasq/cocotron,yuhangwang/cocotron,cjwl/cocotron,crystax/android-vendor-cocotron,guestOS/guestOS,crystax/android-vendor-cocotron,JackLian/cocotron,cjwl/cocotron,JackLian/cocotron,yuhangwang/cocotron,gemu2015/cocotron-sierra,cyclaero/cocotron,plasq/cocotron,gemu2015/cocotron-sierra,cyclaero/cocotron,cjwl/cocotron,guestOS/guestOS,ruppmatt/cocotron,cneira/cocotron,plasq/cocotron