build, qt: No longer need to set QT_RCC_TEST=1 for determinism

Since Qt 5.3.1 hash seeding is disabled for rcc.
See commit 5283a6c87beac5a43f612786fefd6e43f2c70bf6.

Author: hebasto

contrib/gitian-descriptors/gitian-linux.yml

@@ -55,7 +55,6 @@ script: |
   HOST_CXXFLAGS="-O2 -g"
   HOST_LDFLAGS_BASE="-static-libstdc++ -Wl,-O2"
 
-  export QT_RCC_TEST=1
   export QT_RCC_SOURCE_DATE_OVERRIDE=1
   export TZ="UTC"
   export BUILD_DIR="$PWD"

contrib/gitian-descriptors/gitian-osx.yml

@@ -41,7 +41,6 @@ script: |
   FAKETIME_HOST_PROGS=""
   FAKETIME_PROGS="ar ranlib date dmg xorrisofs"
 
-  export QT_RCC_TEST=1
   export QT_RCC_SOURCE_DATE_OVERRIDE=1
   export TZ="UTC"
   export BUILD_DIR="$PWD"

contrib/gitian-descriptors/gitian-win.yml

@@ -37,7 +37,6 @@ script: |
   HOST_CFLAGS="-O2 -g -fno-ident"
   HOST_CXXFLAGS="-O2 -g -fno-ident"
 
-  export QT_RCC_TEST=1
   export QT_RCC_SOURCE_DATE_OVERRIDE=1
   export TZ="UTC"
   export BUILD_DIR="$PWD"

contrib/guix/libexec/build.sh

@@ -175,7 +175,6 @@ case "$HOST" in
 esac
 
 # Environment variables for determinism
-export QT_RCC_TEST=1
 export QT_RCC_SOURCE_DATE_OVERRIDE=1
 export TAR_OPTIONS="--owner=0 --group=0 --numeric-owner --mtime='@${SOURCE_DATE_EPOCH}' --sort=name"
 export TZ="UTC"

depends/packages/qt.mk

@@ -173,7 +173,6 @@ $(package)_config_opts_armv7a_android += -android-arch armeabi-v7a
 $(package)_config_opts_x86_64_android += -android-arch x86_64
 $(package)_config_opts_i686_android += -android-arch i686
 
-$(package)_build_env  = QT_RCC_TEST=1
 $(package)_build_env += QT_RCC_SOURCE_DATE_OVERRIDE=1
 endef