Add PKGSPEC to the different love/* versions as they don't provide

backwards compatibility. This allows games/indierunner to install the
different versions simultaneously as dependencies.
ok op@ (maintainer)

games/love/0.10/Makefile

@@ -1,6 +1,7 @@
 VERSION =		0.10.2
 USE_LUAJIT =		No
 REVISION =		3
+PKGSPEC =		love->=${VERSION},<0.11
 
 SHARED_LIBS=		love-${VERSION}	0.0
 

games/love/0.8/Makefile

@@ -1,6 +1,7 @@
 VERSION =		0.8.0
 USE_LUAJIT =		No
 REVISION =		19
+PKGSPEC =		love->=${VERSION},<0.9
 
 WANTLIB += ${COMPILER_LIBCXX} GL IL Iex-3_4 IlmThread-3_4 Imath-3_2
 WANTLIB += OpenEXR-3_4 OpenEXRCore-3_4 OpenEXRUtil-3_4 SDL X11

games/love/11/Makefile

@@ -4,6 +4,7 @@ NOT_FOR_ARCHS =		${BE_ARCHS}
 
 VERSION =		11.5
 REVISION =		2
+PKGSPEC =		love->=${VERSION},<12
 
 SHARED_LIBS =		love-${VERSION}	0.0