gnome-power-manager: fix compilation: `libtool: Command not found`
gnome-power-manager: fix compilation: `libtool: Command not found`

* libtool is hardcoded in src/Makefile and leads to
libtool: Command not found

Signed-off-by: Eric Bénard <96f164ad4d9b2b0dacf8ebee2bb1eeb3aa69adf1@eukrea.com>
Acked-by: Paul Menzel <acd6d3b156327487a919475da61b8867f1e8b249@users.sourceforge.net>

openembedded/openembedded,JamesAng/oe,BlackPole/bp-openembedded,sentient-energy/emsw-oe-mirror,yyli/overo-oe,giobauermeister/openembedded,buglabs/oe-buglabs,dave-billin/overo-ui-moos-auv,xifengchuo/openembedded,nx111/openembeded_openpli2.1_nx111,scottellis/overo-oe,sampov2/audio-openembedded,rascalmicro/openembedded-rascal,BlackPole/bp-openembedded,openembedded/openembedded,openembedded/openembedded,mrchapp/arago-oe-dev,sentient-energy/emsw-oe-mirror,thebohemian/openembedded,SIFTeam/openembedded,JamesAng/oe,dellysunnymtech/sakoman-oe,sampov2/audio-openembedded,buglabs/oe-buglabs,hulifox008/openembedded,JamesAng/oe,buglabs/oe-buglabs,SIFTeam/openembedded,JamesAng/goe,nx111/openembeded_openpli2.1_nx111,giobauermeister/openembedded,nx111/openembeded_openpli2.1_nx111,scottellis/overo-oe,dave-billin/overo-ui-moos-auv,JamesAng/oe,xifengchuo/openembedded,John-NY/overo-oe,rascalmicro/openembedded-rascal,thebohemian/openembedded,yyli/overo-oe,mrchapp/arago-oe-dev,JamesAng/goe,buglabs/oe-buglabs,openembedded/openembedded,xifengchuo/openembedded,openembedded/openembedded,rascalmicro/openembedded-rascal,JamesAng/goe,dellysunnymtech/sakoman-oe,nx111/openembeded_openpli2.1_nx111,SIFTeam/openembedded,dellysunnymtech/sakoman-oe,hulifox008/openembedded,thebohemian/openembedded,hulifox008/openembedded,dellysunnymtech/sakoman-oe,rascalmicro/openembedded-rascal,scottellis/overo-oe,sutajiokousagi/openembedded,thebohemian/openembedded,openembedded/openembedded,yyli/overo-oe,xifengchuo/openembedded,scottellis/overo-oe,scottellis/overo-oe,SIFTeam/openembedded,BlackPole/bp-openembedded,JamesAng/goe,rascalmicro/openembedded-rascal,SIFTeam/openembedded,sampov2/audio-openembedded,xifengchuo/openembedded,sutajiokousagi/openembedded,John-NY/overo-oe,dave-billin/overo-ui-moos-auv,BlackPole/bp-openembedded,thebohemian/openembedded,xifengchuo/openembedded,giobauermeister/openembedded,dellysunnymtech/sakoman-oe,JamesAng/goe,scottellis/overo-oe,thebohemian/openembedded,dellysunnymtech/sakoman-oe,John-NY/overo-oe,giobauermeister/openembedded,JamesAng/goe,nx111/openembeded_openpli2.1_nx111,openembedded/openembedded,dave-billin/overo-ui-moos-auv,mrchapp/arago-oe-dev,giobauermeister/openembedded,John-NY/overo-oe,scottellis/overo-oe,mrchapp/arago-oe-dev,sutajiokousagi/openembedded,mrchapp/arago-oe-dev,nx111/openembeded_openpli2.1_nx111,dellysunnymtech/sakoman-oe,John-NY/overo-oe,JamesAng/oe,sutajiokousagi/openembedded,JamesAng/goe,xifengchuo/openembedded,sledz/oe,sentient-energy/emsw-oe-mirror,buglabs/oe-buglabs,sampov2/audio-openembedded,BlackPole/bp-openembedded,sentient-energy/emsw-oe-mirror,sledz/oe,sentient-energy/emsw-oe-mirror,yyli/overo-oe,mrchapp/arago-oe-dev,SIFTeam/openembedded,sledz/oe,openembedded/openembedded,dave-billin/overo-ui-moos-auv,sutajiokousagi/openembedded,openembedded/openembedded,hulifox008/openembedded,sampov2/audio-openembedded,yyli/overo-oe,rascalmicro/openembedded-rascal,buglabs/oe-buglabs,thebohemian/openembedded,BlackPole/bp-openembedded,nx111/openembeded_openpli2.1_nx111,giobauermeister/openembedded,sampov2/audio-openembedded,sledz/oe,hulifox008/openembedded,dellysunnymtech/sakoman-oe,rascalmicro/openembedded-rascal,sutajiokousagi/openembedded,dave-billin/overo-ui-moos-auv,sentient-energy/emsw-oe-mirror,giobauermeister/openembedded,hulifox008/openembedded,giobauermeister/openembedded,rascalmicro/openembedded-rascal,sentient-energy/emsw-oe-mirror,sledz/oe,mrchapp/arago-oe-dev,sampov2/audio-openembedded,sledz/oe,SIFTeam/openembedded,xifengchuo/openembedded,dave-billin/overo-ui-moos-auv,BlackPole/bp-openembedded,buglabs/oe-buglabs,dellysunnymtech/sakoman-oe,openembedded/openembedded,yyli/overo-oe,John-NY/overo-oe,yyli/overo-oe,openembedded/openembedded,yyli/overo-oe,sutajiokousagi/openembedded,nx111/openembeded_openpli2.1_nx111,John-NY/overo-oe,JamesAng/oe,hulifox008/openembedded,xifengchuo/openembedded,sledz/oe,buglabs/oe-buglabs,giobauermeister/openembedded,JamesAng/oe