Fix suggestions and bugs spotted by zlin

https://galileo.mailstation.de/gerrit/#/c/5864/

packages/games-fps/duke3d-data/duke3d-data-1.0.exheres-0

@@ -10,7 +10,7 @@ LICENCES="DUKE3D GOG-EULA"
 SLOT="0"
 PLATFORMS="amd64 hppa ppc x86"
 MYOPTIONS=""
-RESTRICT="mirror bindist fetch"
+RESTRICT="fetch"
 
 DEPENDENCIES="
     build:

packages/games-fps/eduke32/eduke32-scm.exheres-0

@@ -43,7 +43,12 @@ MYOPTIONS="
     tools [[ description = [ Build several tools for modding and
                              development ] ]]
     vpx [[ description = [ Enable support for WebM VP8 Codecs ] ]]
-    ( opl-musicpack sc55-musicpack ) [[ number-selected = at-most-one ]]
+    (
+      opl-musicpack [[ description = [ Include optional OPL (AdLib)
+                                       music pack ] ]]
+      sc55-musicpack [[ description = [ Include optional Roland SC-55
+                                        music pack ] ]]
+    ) [[ number-selected = at-most-one ]]
 "
 
 DEPENDENCIES="

packages/games-fps/openarena/openarena-0.8.8.exheres-0

@@ -46,8 +46,6 @@ src_prepare() {
 }
 
 src_compile() {
-    export CC=${CC} CXX=${CXX} LD=${LD} AR=${AR} RANLIB=${RANLIB}
-
     emake -C ${MY_S} \
         V=1 \
         DEFAULT_BASEDIR="${OA_SHARE_DIR}" \

packages/games-fps/urbanterror/urbanterror-4.2.023.exheres-0

@@ -65,7 +65,7 @@ src_unpack() {
 }
 
 src_compile() {
-    env -u TARGETS -u PLATFORM emake \
+    edo env -u TARGETS -u PLATFORM emake \
         ARCH=$(option platform:amd64 "x86_64" "i386") \
         PLATFORM=linux \
         DEFAULT_BASEDIR="/usr/share/${PN}" \

packages/games-fps/xonotic/xonotic-0.8.1.exheres-0

@@ -68,8 +68,6 @@ src_prepare() {
 src_compile() {
     local i
 
-    export CC=${CC} CXX=${CXX} LD=${LD} AR=${AR} RANLIB=${RANLIB}
-
     # fixes parallel build issues
     for i in sv-release cl-release sdl-release ; do
         emake \